excavation vs fracking

excavation and fracking both are nouns.

Word	Noun	Adjective	Verb	Adverb
excavation	Yes	No	No	No
fracking	Yes	No	No	No

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

excavation: the act of extracting ores or coal etc from the earth
fracking: a well-stimulation technique in which rock is fractured by a pressurized liquid

Other hyponyms of excavation include placer mining, opencast mining, strip mining, salt-working, salt working.

excavation (noun)	fracking (noun)
the act of extracting ores or coal etc from the earth	a well-stimulation technique in which rock is fractured by a pressurized liquid
the act of digging
a hole in the ground made by excavating
the site of an archeological exploration