nip and tuck vs neck and neck

nip and tuck is a noun but neck and neck is not a noun.

Word	Noun	Adjective	Verb	Adverb
nip and tuck	Yes	Yes	No	Yes
neck and neck	No	Yes	No	Yes

As adjectives, nip and tuck and neck and neck are synonyms defined as:

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

Other synonyms of nip and tuck include head-to-head.

As adverbs, nip and tuck and neck and neck are synonyms defined as:

nip and tuck and neck and neck: even or close in a race or competition or comparison

Other synonyms of nip and tuck include head-to-head.

nip and tuck (noun)	neck and neck (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)	neck and neck (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

nip and tuck (adverb)	neck and neck (adverb)
even or close in a race or competition or comparison	even or close in a race or competition or comparison