hollow out vs excavate

hollow out and excavate both are verbs.

Word	Noun	Adjective	Verb	Adverb
hollow out	No	No	Yes	No
excavate	No	No	Yes	No

As verbs, excavate is a hyponym of hollow out; that is, excavate is a word with a more specific, narrower meaning than hollow out:

Other hyponyms of hollow out include gouge, rout, scallop, scollop, hole, draw in, suck in, scoop out, cavern, cavern out, cave, undermine, dig, dig out, core.

hollow out (verb)	excavate (verb)
remove the interior of	find by digging in the ground
	remove the inner part or the core of
	form by hollowing
	recover through digging