tummy tuck vs plastic surgery

tummy tuck and plastic surgery both are nouns.

Word	Noun	Adjective	Verb	Adverb
tummy tuck	Yes	No	No	No
plastic surgery	Yes	No	No	No

As nouns, plastic surgery is a hypernym of tummy tuck; that is, plastic surgery is a word with a broader meaning than tummy tuck:

tummy tuck: cosmetic surgery of the abdomen to remove wrinkles and tighten the skin over the stomach
plastic surgery: surgery concerned with therapeutic or cosmetic reformation of tissue

Other hypernyms of tummy tuck include anaplasty, reconstructive surgery.

tummy tuck (noun)	plastic surgery (noun)
cosmetic surgery of the abdomen to remove wrinkles and tighten the skin over the stomach	surgery concerned with therapeutic or cosmetic reformation of tissue