wall unit vs furniture

wall unit and furniture both are nouns.

Word	Noun	Adjective	Verb	Adverb
wall unit	Yes	No	No	No
furniture	Yes	No	No	No

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

wall unit: a piece of furniture having several units that stands against one wall of a room
furniture: furnishings that make a room or other area ready for occupancy

Other hypernyms of wall unit include article of furniture, piece of furniture.

wall unit (noun)	furniture (noun)
a piece of furniture having several units that stands against one wall of a room	furnishings that make a room or other area ready for occupancy