increment vs tax hike

increment and tax hike both are nouns.

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

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

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