land site vs excavation

land site and excavation both are nouns.

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

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

land site: the piece of land on which something is located (or is to be located)
excavation: the site of an archeological exploration

land site (noun)	excavation (noun)
the piece of land on which something is located (or is to be located)	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