groom vs ostler

groom and ostler both are nouns.

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

As nouns, groom and ostler are synonyms defined as:

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

Other synonyms of groom include hostler, stableboy, stableman.

groom (noun)	ostler (noun)
a man who has recently been married	someone employed in a stable to take care of the horses
someone employed in a stable to take care of the horses
a man participant in his own marriage ceremony

groom (verb)	ostler (verb)
care for one's external appearance
give a neat appearance to
educate for a future role or function