harpsichord vs clavier

harpsichord and clavier both are nouns.

Word	Noun	Adjective	Verb	Adverb
harpsichord	Yes	No	No	No
clavier	Yes	No	No	No

As nouns, clavier is a hypernym of harpsichord; that is, clavier is a word with a broader meaning than harpsichord:

harpsichord: a clavier with strings that are plucked by plectra mounted on pivots
clavier: a stringed instrument that has a keyboard

Other hypernyms of harpsichord include Klavier.

harpsichord (noun)	clavier (noun)
a clavier with strings that are plucked by plectra mounted on pivots	a bank of keys on a musical instrument
	a stringed instrument that has a keyboard