warhorse vs old stager

warhorse and old stager both are nouns.

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

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

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

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

warhorse (noun)	old stager (noun)
horse used in war	an experienced person who has been through many battles; someone who has given long service
a work of art (composition or drama) that is part of the standard repertory but has become hackneyed from much repetition
an experienced person who has been through many battles; someone who has given long service