ostler vs hostler

ostler and hostler both are nouns.

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

As nouns, ostler and hostler are synonyms defined as:

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

Other synonyms of ostler include groom, stableboy, stableman.

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