drill hole vs excavation

drill hole and excavation both are nouns.

Word	Noun	Adjective	Verb	Adverb
drill hole	Yes	No	No	No
excavation	Yes	No	No	No

As nouns, excavation is a hypernym of drill hole; that is, excavation is a word with a broader meaning than drill hole:

drill hole: a hole or passage made by a drill; usually made for exploratory purposes
excavation: a hole in the ground made by excavating

drill hole (noun)	excavation (noun)
a hole or passage made by a drill; usually made for exploratory purposes	the act of extracting ores or coal etc from the earth
	the act of digging
	a hole in the ground made by excavating
	the site of an archeological exploration