increase vs tax hike

increase and tax hike both are nouns.

Word	Noun	Adjective	Verb	Adverb
increase	Yes	No	Yes	No
tax hike	Yes	No	No	No

As nouns, tax hike is a hyponym of increase; that is, tax hike is a word with a more specific, narrower meaning than increase:

increase (noun)	tax hike (noun)
the act of increasing something	the amount by which taxes are increased
the amount by which something increases
a change resulting in an increase
a process of becoming larger or longer or more numerous or more important
a quantity that is added

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