gaffer vs ganger

gaffer and ganger both are nouns.

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

As nouns, ganger is a hyponym of gaffer; that is, ganger is a word with a more specific, narrower meaning than gaffer:

Other hyponyms of gaffer include baas, assistant foreman, straw boss.

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