equal vs fifty-fifty

equal is a noun but fifty-fifty is not a noun.

Word	Noun	Adjective	Verb	Adverb
equal	Yes	Yes	Yes	No
fifty-fifty	No	Yes	No	No

equal (noun)	fifty-fifty (noun)
a person who is of equal standing with another in a group

equal (adjective)	fifty-fifty (adjective)
having the same quantity, value, or measure as another	equal in degree or extent or amount; or equally matched or balanced
having the requisite qualities or resources to meet a task

equal (verb)	fifty-fifty (verb)
make equal, uniform, corresponding, or matching
be identical or equivalent to
be equal to in quality or ability