ganger vs gaffer

ganger and gaffer both are nouns.

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

As nouns, gaffer is a hypernym of ganger; that is, gaffer is a word with a broader meaning than ganger:

Other hypernyms of ganger include boss, chief, foreman, honcho.

ganger (noun)	gaffer (noun)
the foreman of a work gang	a person who exercises control over workers
	an elderly man
	an electrician responsible for lighting on a movie or tv set