trouble shooter vs repairman

trouble shooter and repairman both are nouns.

Word	Noun	Adjective	Verb	Adverb
trouble shooter	Yes	No	No	No
repairman	Yes	No	No	No

As nouns, repairman is a hypernym of trouble shooter; that is, repairman is a word with a broader meaning than trouble shooter:

trouble shooter: a worker whose job is to locate and fix sources of trouble (especially in mechanical devices)
repairman: a skilled worker whose job is to repair things

Other hypernyms of trouble shooter include maintenance man, service man.

trouble shooter (noun)	repairman (noun)
a worker whose job is to locate and fix sources of trouble (especially in mechanical devices)	a skilled worker whose job is to repair things