hole vs posthole

hole and posthole both are nouns.

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

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

hole (noun)	posthole (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)	posthole (verb)
make holes in
hit the ball into the hole