gaffer vs oldtimer

gaffer and oldtimer both are nouns.

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

As nouns, gaffer and oldtimer are synonyms defined as:

Other synonyms of gaffer include antique, old-timer, old geezer.

gaffer (noun)	oldtimer (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