warhorse vs old-timer

warhorse and old-timer both are nouns.

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

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

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

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

warhorse (noun)	old-timer (noun)
horse used in war	an elderly man
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
an experienced person who has been through many battles; someone who has given long service