tax boost vs increase

tax boost and increase both are nouns.

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

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

Other hypernyms of tax boost include increment.

tax boost (noun)	increase (noun)
the amount by which taxes are increased	the act of increasing something
	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

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