excavation vs land site

excavation and land site both are nouns.

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

As nouns, land site is a hypernym of excavation; that is, land site is a word with a broader meaning than excavation:

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

Other hypernyms of excavation include site.

excavation (noun)	land site (noun)
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
a hole in the ground made by excavating
the site of an archeological exploration