repairman vs maintenance man

repairman and maintenance man both are nouns.

Word	Noun	Adjective	Verb	Adverb
repairman	Yes	No	No	No
maintenance man	Yes	No	No	No

As nouns, repairman and maintenance man are synonyms defined as:

repairman and maintenance man: a skilled worker whose job is to repair things

Other synonyms of repairman include service man.

repairman (noun)	maintenance man (noun)
a skilled worker whose job is to repair things	a skilled worker whose job is to repair things