piano keyboard vs forte-piano

piano keyboard and forte-piano both are nouns.

Word	Noun	Adjective	Verb	Adverb
piano keyboard	Yes	No	No	No
forte-piano	Yes	No	No	No

piano keyboard (noun)	forte-piano (noun)
a bank of keys on a musical instrument	a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds