harpsichord vs Klavier

harpsichord and Klavier both are nouns.

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

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

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

Other hypernyms of harpsichord include clavier.

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