machine; mechanism; instrument; appliance; apparatus
not yet developed; undeveloped; underdeveloped
hard to figure out; elusive; slippery; vague; subtle
voice; speech; phone (as opposed to a phoneme); speech sound; audio; sound (as opposed to the picture)
function; facility; faculty; feature
box; case; car (of a train, etc.); shamisen case; shamisen; public building; community building
wheel (esp. of a vehicle)
sense of touch; tactile; haptic; hair style with long bangs
sense of smell; olfaction
to catch; to capture; to grasp (e.g. meaning); to perceive; to captivate; to move (one's heart)
to turn one's face; to turn around; to look over one's shoulder
young bird; chick; fledgling; hina doll; doll displayed during the Girls' Festival
to retreat; to back off; to draw back; to step back; to shrink away
simple; plain; uncomplicated; straightforward; simple-minded; naive
several; a few; number; quantity; counting; calculation; number
pattern; behavioural pattern; behavioral pattern; predictability
participant; entrant; player; competitor
rate; ratio; one tenth; ten percent; (comparative) profit; gain; assignment
wise; clever; smart; well-behaved (esp. children and pets); obedient; good
cute; adorable; dear; precious; innocent; childlike
subject (of a medical experiment, etc.); test subject; trial subject; examinee (of a full-body scan, etc.)
reaction; response; physical reaction (to a stimulus); observable response (of an organism); reaction; effect
that is to say; so that means
dot; spot; mark (in an exam, etc.); grade; point (in a game); score; point
bargain sale; selling cheaply; selling at a low price; giving out (too) readily; handing out freely; selling (oneself) short
person in charge (including a supervisory role for other staff); person responsible for ...; responsible party; supervisor; manager
unworthy; unbecoming; improper
manner of speaking; verbal argument; objection; protesting a decision (esp. that of a sumo referee); rumor; rumour
boastful; conceited; bragging; impudent
useless; futile; unnecessary; needless; not on business; unrelated
to divert (e.g. one's mind); to distract; to relieve (boredom, sorrow, etc.); to conceal (e.g. one's grief with a smile); to hide; to shift (the conversation)
purpose; goal; aim; objective; intention; motive
facility; facilities; institution; home (for the elderly, orphans, etc.)
doctors; teachers; lawyers
citizen; resident; person; user (of a website, esp. as a collective, e.g. Twittersphere)
to take offense (at); to take offence (at); to feel hurt (by)
as one would expect; naturally; indeed; still; all the same; after all