waist vs wasp waist

waist and wasp waist both are nouns.

Word	Noun	Adjective	Verb	Adverb
waist	Yes	No	No	No
wasp waist	Yes	No	No	No

As nouns, wasp waist is a hyponym of waist; that is, wasp waist is a word with a more specific, narrower meaning than waist:

waist (noun)	wasp waist (noun)
the narrow part of the shoe connecting the heel and the wide part of the sole	a very slender waist
the narrowing of the body between the ribs and hips