stableman vs ostler

stableman and ostler both are nouns.

Word	Noun	Adjective	Verb	Adverb
stableman	Yes	No	No	No
ostler	Yes	No	No	No

As nouns, stableman and ostler are synonyms defined as:

stableman and ostler: someone employed in a stable to take care of the horses

Other synonyms of stableman include groom, hostler, stableboy.

stableman (noun)	ostler (noun)
someone employed in a stable to take care of the horses	someone employed in a stable to take care of the horses