cymbal vs high hat

cymbal and high hat both are nouns.

Word	Noun	Adjective	Verb	Adverb
cymbal	Yes	No	No	No
high hat	Yes	No	No	No

As nouns, high hat is a hyponym of cymbal; that is, high hat is a word with a more specific, narrower meaning than cymbal:

cymbal: a percussion instrument consisting of a concave brass disk; makes a loud crashing sound when hit with a drumstick or when two are struck together
high hat: cymbals that are operated by a foot pedal

Other hyponyms of cymbal include high-hat cymbal, zill.

cymbal (noun)	high hat (noun)
a percussion instrument consisting of a concave brass disk; makes a loud crashing sound when hit with a drumstick or when two are struck together	cymbals that are operated by a foot pedal
	a man's hat with a tall crown; usually covered with silk or with beaver fur