decline vs decrement

decline and decrement both are nouns.

Word	Noun	Adjective	Verb	Adverb
decline	Yes	No	Yes	No
decrement	Yes	No	No	No

As nouns, decrement is a hypernym of decline; that is, decrement is a word with a broader meaning than decline:

Other hypernyms of decline include decrease.

As nouns, decrement is a hypernym of decline; that is, decrement is a word with a broader meaning than decline:

Other hypernyms of decline include decrease.

decline (noun)	decrement (noun)
a downward slope or bend	the amount by which something decreases
a gradual decrease; as of stored charge or current	a process of becoming smaller or shorter
change toward something smaller or lower
a condition inferior to an earlier condition; a gradual falling off from a better state; decline

decline (verb)	decrement (verb)
grow smaller
grow worse
show unwillingness towards
inflect for number, gender, case, etc.
go down
fall in value
not accept as true