forte-piano vs pianoforte

forte-piano and pianoforte both are nouns.

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

As nouns, forte-piano and pianoforte are synonyms defined as:

forte-piano and pianoforte: a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds

Other synonyms of forte-piano include piano.

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