excavation vs digging

excavation and digging both are nouns.

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

As nouns, excavation and digging are synonyms defined as:

Other synonyms of excavation include dig.

excavation (noun)	digging (noun)
the act of extracting ores or coal etc from the earth	the act of digging
the act of digging
a hole in the ground made by excavating
the site of an archeological exploration