veteran vs old stager

veteran and old stager both are nouns.

Word	Noun	Adjective	Verb	Adverb
veteran	Yes	Yes	No	No
old stager	Yes	No	No	No

As nouns, veteran and old stager are synonyms defined as:

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

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

veteran (noun)	old stager (noun)
an experienced person who has been through many battles; someone who has given long service	an experienced person who has been through many battles; someone who has given long service
a person who has served in the armed forces
a serviceman who has seen considerable active service

veteran (adjective)	old stager (adjective)
rendered competent through trial and experience