Sheraton vs piece of furniture

Sheraton and piece of furniture both are nouns.

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

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

Sheraton: a furniture style that originated in England around 1800; simple in design with straight lines and classical ornamentation
piece of furniture: furnishings that make a room or other area ready for occupancy

Other hypernyms of Sheraton include article of furniture, furniture.

Sheraton (noun)	piece of furniture (noun)
a furniture style that originated in England around 1800; simple in design with straight lines and classical ornamentation	furnishings that make a room or other area ready for occupancy