old stager vs old-timer

old stager and old-timer both are nouns.

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

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

old stager and old-timer: an experienced person who has been through many battles; someone who has given long service

Other synonyms of old stager include old hand, oldtimer, stager, veteran, warhorse.

old stager (noun)	old-timer (noun)
an experienced person who has been through many battles; someone who has given long service	an elderly man
	an experienced person who has been through many battles; someone who has given long service