rhinoceros beetle (esp. the Japanese rhinoceros beetle, Trypoxylus dichotomus)
pillbug; pill bug; woodlouse; sowbug; sow bug; slater
hornworm (caterpillar of a hawk moth); (hairless) caterpillar
ladybug; ladybird; lady beetle; Asian lady beetle (Harmonia axyridis); harlequin ladybird
shield bug; stink bug; pentatomid
scarabaeid beetle; Mimela splendens (metallic-green scarabaeid beetle)
ground beetle; carabid (esp. of superfamily Caraboidea, but excluding subfamily Carabinae); Anisodactylus signatus (species of ground beetle)
Paramecium spp. (esp. Paramecium caudatum)
worm; insect; insignificant person; pathetic person
jewel beetle (esp. Chrysochroa fulgidissima); buprestid
aphid; plant louse; cockroach; Japanese house bat (Pipistrellus abramus); hanger-on; parasite
bloodworm (Halla okudai); red mite (Trombicula akamushi); chigger mite; harvest mite
long-horned beetle; longicorn; beetle of the cerambycidae family
bell cricket (Meloimorpha japonica); (arch.) pine cricket (Xenogryllus marmoratus)
giant isopod (Bathynomus giganteus)
dung beetle; gold beetle; goldbug; maggots in faeces (feces)
hunchback; humpback; crookback; rickets
leaf beetle (of family Chrysomelidae)
any horsehair worm of class Gordioidea; gordian worm (of class Gordioidea); hair worm (of class Gordioidea); wireworm (click beetle larva)
euglena (freshwater flagellate)
wood louse; wood lice; slater
inchworm; measuring worm; looper (caterpillar)
hairy caterpillar; woolly bear; pest; nudnik (nudnick)
Mecopoda nipponensis (species of katydid)
dobsonfly or stonefly larva
click beetle; skipjack (beetle of family Elateridae)
cabbageworm (caterpillar of the cabbage white butterfly)
pine cricket (Xenogryllus marmoratus); (arch.) bell cricket (Meloimorpha japonica)
stomach acid that flows backwards into the mouth (due to acid reflux)
rhizocephala (parasitic barnacles)
bed bug (Cimex lectularius); bedbug
harvestman; daddy longlegs (arachnid of order Opiliones)
leaf insect (esp. species Phyllium pulchrifolium)
caddis worm; caddis-worm (caddisfly larva)
feeling in one's bones; foreboding; premonition; presentiment; gut feeling; gut instinct
bark beetle (Scolytidae spp.); gribble (Limnoria lignorum); grain borer; wood borer
ringworm (of the body); tinea corporis
bombardier beetle (esp. species Pheropsophus jessoensis); stink bug
ribbon worm (any worm of phylum Nemertea)
Chinese wax scale insect (Ericerus pela)
worm-eaten; moth-eaten; holes eaten in clothing, leaves, etc. by caterpillars, moths, etc.; leaf warbler (any bird of genus Phylloscopus); chiffchaff
athlete's foot; water boatman (esp. species Hesperocorixa distanti); Asellus hilgendorfi (species of aquatic sowbug)
insect catching; bug catching
aquatic insect larva (esp. of caddisflies, mayflies, etc.)
toilet insect; insects that frequent toilets
kanji "insect" radical at left
springtail (wingless insect of the order Collembola)
insects harmful to pine trees
cochineal insect (Dactylopius coccus)
Notonecta triguttata (species of backswimmer)
pseudoscorpion (any arachnid of order Pseudoscorpionida); false scorpion
vestimentiferan (any tube worm of order Vestimentifera)
acorn worm (any hemichordate of class Enteropneusta)
viburnum; Viburnum furcatum
bombardier beetle (esp. species Pheropsophus jessoensis); stink bug
hister beetle (Hister jekeli); clown beetle
sickle-bearing bush-cricket (Phaneroptera falcata)
common butterwort (Pinguicula vulgaris)
biting louse (any louse of order Mallophaga); small winged insect (esp. a flying ant or termite)
roundworm (Ascaris lumbricoides); mawworm; feelings that influence one's mood; stomach growling
insecticide; insect repellent
peanut worm (any worm of phylum Sipuncula)
dying breath; dying whisper; being at death's door
undesirable lover (boyfriend, girlfriend); passion; temper; irritability
singing of insects (esp. in autumn); sound of insects
interferer; meddler; buttinsky
calls and sounds made by insects
magnifying glass; wrestler of the lowest rank
snake in one's bosom; treacherous friend
bookworm; bibliophile; bibliophage
bookworm; bibliophile; bibliophage
insect bite; bug bite; sting
small insect; midge; vermicule
rushing to one's doom; (like a) moth flying into the flame
scarabaeid beetle grub; any insect (or worm, etc.) that lives in soil
money loser; high-cost, low-return project
caterpillar fungus (esp. Cordyceps sinensis)
some prefer nettles; there's no accounting for taste; every man to his taste
bur (prickly seeds or seedheads that stick to fur and clothes); burr
flies that appear in Tohoku and Hokkaido in late autumn or early winter (esp. the woolly apple aphid); flies that appear above fallen snow in the early spring (esp. certain species of small winter stonefly and true crane fly)
deworming medicine; anthelmintic
summer insect; summer insects
pin (esp. for mounting insects); setting pin
caterpillar (esp. hairless); person with scanty supply of clothes
convulsions (in a child); nervousness; short-temperedness; bug thought to cause children's diseases
tread on a worm and it will turn; even a tiny bug will defend itself; even the weakest and smallest beings have their own wills, so do not make light of them
eunicid worm (Marphysa sanguinea); lugworm (Arenicola brasiliensis); black-colored insect (e.g. stag beetles)
workaholic; person who is totally devoted to his work
torch procession to drive away crop-eating insects
moth larva (oft. used as bait for mountain stream fishing)
moss animal (any animal of phylum Bryozoa)
snack for an empty stomach; something to tide one over
incantation to rid a child of insects traditionally believed to cause disease; charm to cure colic, tantrums, etc.
ground beetle; carabid (esp. of subfamily Carabinae); (arch.) millipede
mushi-ken; Japanese rock-paper-scissors variant, in which the "frog", "snake" and "slug" are represented by the thumb, forefinger and little finger respectively
diligent student; drudge; swot
carrion beetle (any beetle of family Silphidae, incl. burying beetles)
leaf folder (caterpillar)
rice weevil; good-for-nothing; parasite; deadbeat
first spring thunderstorm of the year
Marphysa sanguinea (species of eunicid worm)
stinky bug (esp. the bombardier beetle); stink bug
bur (prickly seeds or seedheads that stick to fur and clothes); burr
Protura (order of wingless insects)
violin beetle (Mormolyce phyllodes); ghost walker
velvet worm (Onychophora)
schizomid (any arachnid of order Schizomida)
lace bug (any insect of family Tingidae)
inocelliid snakefly (any insect of family Inocelliidae)
phoronid (any wormlike animal of phylum Phoronida)
tongue worm (any worm of phylum Pentastomida)
beard worm (any worm of phylum Pogonophora)
arrow worm (any worm of phylum Chaetognatha)
Protura (order of wingless insects)
proturan (any wingless insect of order Protura)
flatworm; flat worm; flat bark beetle
Bothrogonia ferruginea (species of leafhopper)
violin beetle (Mormolyce phyllodes); ghost walker
wooly apple aphid (Eriosoma lanigerum)
children's medicine for nervousness; snack for an empty stomach
true bristletail (any insect of order Thysanura, esp. of family Lepismatidae)
true bristletail (any insect of order Thysanura, esp. of family Lepismatidae)
Protura (order of wingless insects)
xenoturbellan (either of two species of worm-like basal deuterostomes)
mythical spirit residing in a person's body that generates a desire to drink (also said to turn water into alcohol)
mythical spirit residing in a person's body that generates a desire to drink (also said to turn water into alcohol)
someone who curls up under a kotatsu all winter; kotatsu bug; kotatsu snail
mushifuda; stripped hanafuda deck consisting of 40 cards
Scyphozoa; true jellyfish
The Gold-Bug (short story by Edgar Allan Poe, 1843)
insect peddler (esp. fireflies and crickets)