tax hike vs increment

tax hike and increment both are nouns.

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

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

Other hypernyms of tax hike include increase.

tax hike (noun)	increment (noun)
the amount by which taxes are increased	the amount by which something increases
	a process of becoming larger or longer or more numerous or more important