overseas cap vs garrison cap

overseas cap and garrison cap both are nouns.

Word	Noun	Adjective	Verb	Adverb
overseas cap	Yes	No	No	No
garrison cap	Yes	No	No	No

As nouns, overseas cap and garrison cap are synonyms defined as:

overseas cap and garrison cap: a wedge-shaped wool or cotton cap; worn as part of a uniform

overseas cap (noun)	garrison cap (noun)
a wedge-shaped wool or cotton cap; worn as part of a uniform	a wedge-shaped wool or cotton cap; worn as part of a uniform