excavate vs excavator

excavate is not a noun while excavator is a noun.

Word	Noun	Adjective	Verb	Adverb
excavate	No	No	Yes	No
excavator	Yes	No	No	No

excavate (noun)	excavator (noun)
	a machine for excavating
	a workman who excavates for foundations of buildings or for quarrying

excavate (verb)	excavator (verb)
find by digging in the ground
remove the inner part or the core of
form by hollowing
recover through digging