yachting cap vs peaked cap

yachting cap and peaked cap both are nouns.

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

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

Other synonyms of yachting cap include kepi, service cap.

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