office furniture vs furniture

office furniture and furniture both are nouns.

Word	Noun	Adjective	Verb	Adverb
office furniture	Yes	No	No	No
furniture	Yes	No	No	No

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

Other hypernyms of office furniture include article of furniture, piece of furniture.

office furniture (noun)	furniture (noun)
furniture intended for use in an office	furnishings that make a room or other area ready for occupancy