fitment vs piece of furniture

fitment and piece of furniture both are nouns.

Word	Noun	Adjective	Verb	Adverb
fitment	Yes	No	No	No
piece of furniture	Yes	No	No	No

As nouns, piece of furniture is a hypernym of fitment; that is, piece of furniture is a word with a broader meaning than fitment:

fitment: any of the items furnishing or equipping a room (especially built-in furniture)
piece of furniture: furnishings that make a room or other area ready for occupancy

Other hypernyms of fitment include article of furniture, furniture.

fitment (noun)	piece of furniture (noun)
any of the items furnishing or equipping a room (especially built-in furniture)	furnishings that make a room or other area ready for occupancy