foreman vs gaffer

foreman and gaffer both are nouns.

Word	Noun	Adjective	Verb	Adverb
foreman	Yes	No	No	No
gaffer	Yes	No	No	No

As nouns, foreman and gaffer are synonyms defined as:

Other synonyms of foreman include boss, chief, honcho.

foreman (noun)	gaffer (noun)
a person who exercises control over workers	a person who exercises control over workers
a man who is foreperson of a jury	an elderly man
	an electrician responsible for lighting on a movie or tv set