increment vs tax boost

increment and tax boost both are nouns.

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

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

increment (noun)	tax boost (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