excavation vs bore-hole

excavation and bore-hole both are nouns.

Word	Noun	Adjective	Verb	Adverb
excavation	Yes	No	No	No
bore-hole	Yes	No	No	No

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

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

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