site vs excavation

site and excavation both are nouns.

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

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

site (noun)	excavation (noun)
a computer connected to the internet that maintains a series of web pages on the World Wide Web; a computer connected to the internet that maintains a series of web pages on the World Wide Web	the act of extracting ores or coal etc from the earth
the piece of land on which something is located (or is to be located)	the act of digging
physical position in relation to the surroundings	a hole in the ground made by excavating
	the site of an archeological exploration

site (verb)	excavation (verb)
assign a location to