graybeard vs gaffer

graybeard and gaffer both are nouns.

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

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

Other hyponyms of graybeard include codger, old codger, antique, old-timer, old geezer, oldtimer, patriarch.

graybeard (noun)	gaffer (noun)
a man who is very old	a person who exercises control over workers
	an elderly man
	an electrician responsible for lighting on a movie or tv set