gaffer vs electrician

gaffer and electrician both are nouns.

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

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

Other hypernyms of gaffer include lineman, linesman.

gaffer (noun)	electrician (noun)
a person who exercises control over workers	a person who installs or repairs electrical or telephone lines
an elderly man
an electrician responsible for lighting on a movie or tv set