garrison cap vs overseas cap

garrison cap and overseas cap both are nouns.

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

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

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

garrison cap (noun)	overseas 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