natural monument; protected species (animal, habitat, etc.)
natural product; product of nature
natural water; untreated water; spring water
natural airhead; person prone to making silly mistakes
natural airhead; person prone to making silly mistakes
native rock; natural rock
natural airhead; person prone to making silly mistakes
natural colour; natural color; technicolor
natural rubber; India rubber; caoutchouc
naturally-derived; naturally-occurring
natural fibers; natural fibres
natural form (of a vitamin, etc.); native form; naturally occurring
natural perfume; naturally fragrances
natural harbor; natural harbour
natural moisturizing factor; NMF
natural bridge; natural arch