overindulge vs eat

overindulge and eat both are verbs.

Word	Noun	Adjective	Verb	Adverb
overindulge	No	No	Yes	No
eat	No	No	Yes	No

As verbs, eat is a hypernym of overindulge; that is, eat is a word with a broader meaning than overindulge:

overindulge (verb)	eat (verb)
overeat or eat immodestly; make a pig of oneself	cause to deteriorate due to the action of water, air, or an acid
	take in solid food
	eat a meal; take a meal
	take in food; used of animals only
	use up (resources or materials)
	worry or cause anxiety in a persistent way