sake vs rice beer

sake and rice beer both are nouns.

Word	Noun	Adjective	Verb	Adverb
sake	Yes	No	No	No
rice beer	Yes	No	No	No

As nouns, sake and rice beer are synonyms defined as:

sake and rice beer: Japanese alcoholic beverage made from fermented rice; usually served hot

Other synonyms of sake include saki.

sake (noun)	rice beer (noun)
a reason for wanting something done	Japanese alcoholic beverage made from fermented rice; usually served hot
the purpose of achieving or obtaining
Japanese alcoholic beverage made from fermented rice; usually served hot