peaked cap vs service cap

peaked cap and service cap both are nouns.

Word	Noun	Adjective	Verb	Adverb
peaked cap	Yes	No	No	No
service cap	Yes	No	No	No

As nouns, peaked cap and service cap are synonyms defined as:

Other synonyms of peaked cap include kepi, yachting cap.

peaked cap (noun)	service cap (noun)
a cap with a flat circular top and a visor	a cap with a flat circular top and a visor