expansion vs increase

expansion and increase both are nouns.

Word	Noun	Adjective	Verb	Adverb
expansion	Yes	No	No	No
increase	Yes	No	Yes	No

As nouns, increase is a hypernym of expansion; that is, increase is a word with a broader meaning than expansion:

expansion: the act of increasing (something) in size or volume or quantity or scope
increase: the act of increasing something

Other hypernyms of expansion include step-up.

As nouns, increase is a hypernym of expansion; that is, increase is a word with a broader meaning than expansion:

Other hypernyms of expansion include step-up.

expansion (noun)	increase (noun)
the act of increasing (something) in size or volume or quantity or scope	the act of increasing something
adding information or detail	the amount by which something increases
a discussion that provides additional information	a change resulting in an increase
a function expressed as a sum or product of terms	a process of becoming larger or longer or more numerous or more important
	a quantity that is added

expansion (verb)	increase (verb)
	become bigger or greater in amount
	make bigger or more