nip and tuck vs head-to-head

nip and tuck is a noun but head-to-head is not a noun.

Word	Noun	Adjective	Verb	Adverb
nip and tuck	Yes	Yes	No	Yes
head-to-head	No	Yes	No	Yes

As adjectives, nip and tuck and head-to-head are synonyms defined as:

nip and tuck and head-to-head: inconclusive as to outcome; close or just even in a race or comparison or competition

Other synonyms of nip and tuck include neck and neck.

As adverbs, nip and tuck and head-to-head are synonyms defined as:

nip and tuck and head-to-head: even or close in a race or competition or comparison

Other synonyms of nip and tuck include neck and neck.

nip and tuck (noun)	head-to-head (noun)
plastic surgery to remove wrinkles and other signs of aging from your face; an incision is made near the hair line and skin is pulled back and excess tissue is excised

nip and tuck (adjective)	head-to-head (adjective)
inconclusive as to outcome; close or just even in a race or comparison or competition	inconclusive as to outcome; close or just even in a race or comparison or competition
	involving two persons; intimately private

nip and tuck (adverb)	head-to-head (adverb)
even or close in a race or competition or comparison	even or close in a race or competition or comparison