clincher vs determinative

clincher and determinative both are nouns.

Word	Noun	Adjective	Verb	Adverb
clincher	Yes	No	No	No
determinative	Yes	Yes	No	No

As nouns, determinative is a hypernym of clincher; that is, determinative is a word with a broader meaning than clincher:

Other hypernyms of clincher include causal factor, determinant, determiner, determining factor.

clincher (noun)	determinative (noun)
a tool used to clinch nails or bolts or rivets	a determining or causal element or factor
a point or fact or remark that settles something conclusively	one of a limited class of noun modifiers that determine the referents of noun phrases
an argument that is conclusive

clincher (adjective)	determinative (adjective)
	having the power or quality of deciding