Methuselah vs gaffer

Methuselah and gaffer both are nouns.

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

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

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

Methuselah (noun)	gaffer (noun)
(Old Testament) a patriarch (grandfather of Noah) who is said to have lived 969 years	a person who exercises control over workers
a man who is very old	an elderly man
	an electrician responsible for lighting on a movie or tv set