beater vs eggbeater

beater and eggbeater both are nouns.

Word	Noun	Adjective	Verb	Adverb
beater	Yes	No	No	No
eggbeater	Yes	No	No	No

As nouns, eggbeater is a hyponym of beater; that is, eggbeater is a word with a more specific, narrower meaning than beater:

Other hyponyms of beater include carpet beater, rug beater, eggwhisk.

beater (noun)	eggbeater (noun)
an implement for beating	a mixer for beating eggs or whipping cream
a worker who rouses wild game from under cover for a hunter	an aircraft without wings that obtains its lift from the rotation of overhead blades