food elevator vs dumbwaiter

food elevator and dumbwaiter both are nouns.

Word	Noun	Adjective	Verb	Adverb
food elevator	Yes	No	No	No
dumbwaiter	Yes	No	No	No

As nouns, food elevator and dumbwaiter are synonyms defined as:

food elevator and dumbwaiter: a small elevator used to convey food (or other goods) from one floor of a building to another

food elevator (noun)	dumbwaiter (noun)
a small elevator used to convey food (or other goods) from one floor of a building to another	a small elevator used to convey food (or other goods) from one floor of a building to another