"Eats" is a noun.
The word glutton is a noun. A glutton is one who eats excessively.
The part of speech for this particular word is a noun.
part of speech
Like most words, "eating" can be used as different parts of speech. It is a noun when used like this: Eating is fun. It is a verb when used like this: She is eating a hot dog for lunch.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.