rice steamer vs rice cooker

rice steamer and rice cooker both are nouns.

Word	Noun	Adjective	Verb	Adverb
rice steamer	Yes	No	No	No
rice cooker	Yes	No	No	No

As nouns, rice steamer and rice cooker are synonyms defined as:

rice steamer and rice cooker: an automated kitchen appliance designed to boil or steam rice

rice steamer (noun)	rice cooker (noun)
an automated kitchen appliance designed to boil or steam rice	an automated kitchen appliance designed to boil or steam rice