hole vs ear hole

hole and ear hole both are nouns.

Word	Noun	Adjective	Verb	Adverb
hole	Yes	No	Yes	No
ear hole	Yes	No	No	No

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

hole (noun)	ear hole (noun)
an opening deliberately made in or through something	a hole (as in a helmet) for sound to reach the ears
one playing period (from tee to green) on a golf course
informal terms for the mouth
an opening into or through something
a depression hollowed out of solid matter
an unoccupied space
informal terms for a difficult situation
a fault

hole (verb)	ear hole (verb)
make holes in
hit the ball into the hole