infest vs invade

infest and invade both are verbs.

Word	Noun	Adjective	Verb	Adverb
infest	No	No	Yes	No
invade	No	No	Yes	No

As verbs, invade is a hypernym of infest; that is, invade is a word with a broader meaning than infest:

infest: invade in great numbers
invade: march aggressively into another's territory by military force for the purposes of conquest and occupation

Other hypernyms of infest include occupy.

As verbs, infest and invade are synonyms defined as:

Other synonyms of infest include overrun.

infest (verb)	invade (verb)
invade in great numbers	march aggressively into another's territory by military force for the purposes of conquest and occupation
live on or in a host, as of parasites	penetrate or assault, in a harmful or injurious way
occupy in large numbers or live on a host	to intrude upon, infringe, encroach on, violate
	occupy in large numbers or live on a host