hollow vs gopher hole

hollow and gopher hole both are nouns.

Word	Noun	Adjective	Verb	Adverb
hollow	Yes	Yes	Yes	No
gopher hole	Yes	No	No	No

As nouns, gopher hole is a hyponym of hollow; that is, gopher hole is a word with a more specific, narrower meaning than hollow:

hollow (noun)	gopher hole (noun)
a depression hollowed out of solid matter	a hole in the ground made by gophers
a small valley between mountains
a cavity or space in something

hollow (adjective)	gopher hole (adjective)
not solid; having a space or gap or cavity
lacking in substance or character
devoid of significance or force
as if echoing in a hollow space

hollow (verb)	gopher hole (verb)
remove the interior of
remove the inner part or the core of