taxman vs internal revenue agent

taxman and internal revenue agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
taxman	Yes	No	No	No
internal revenue agent	Yes	No	No	No

As nouns, taxman and internal revenue agent are synonyms defined as:

taxman and internal revenue agent: someone who collects taxes for the government

Other synonyms of taxman include collector of internal revenue, exciseman, tax collector.

taxman (noun)	internal revenue agent (noun)
someone who collects taxes for the government	someone who collects taxes for the government