gaffer vs old-timer

gaffer and old-timer both are nouns.

Word	Noun	Adjective	Verb	Adverb
gaffer	Yes	No	No	No
old-timer	Yes	No	No	No

As nouns, gaffer and old-timer are synonyms defined as:

Other synonyms of gaffer include antique, old geezer, oldtimer.

gaffer (noun)	old-timer (noun)
a person who exercises control over workers	an elderly man
an elderly man	an experienced person who has been through many battles; someone who has given long service
an electrician responsible for lighting on a movie or tv set