hole vs post hole

hole and post hole both are nouns.

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

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

hole (noun)	post hole (noun)
an opening deliberately made in or through something	a hole dug in the ground to hold a fence post
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)	post hole (verb)
make holes in
hit the ball into the hole