proliferation vs increment

proliferation and increment both are nouns.

Word	Noun	Adjective	Verb	Adverb
proliferation	Yes	No	No	No
increment	Yes	No	No	No

As nouns, increment is a hypernym of proliferation; that is, increment is a word with a broader meaning than proliferation:

proliferation: a rapid increase in number (especially a rapid increase in the number of deadly weapons)
increment: a process of becoming larger or longer or more numerous or more important

Other hypernyms of proliferation include growth, increase.

proliferation (noun)	increment (noun)
growth by the rapid multiplication of parts	the amount by which something increases
a rapid increase in number (especially a rapid increase in the number of deadly weapons)	a process of becoming larger or longer or more numerous or more important