extirpator vs cultivator

extirpator and cultivator both are nouns.

Word	Noun	Adjective	Verb	Adverb
extirpator	Yes	No	No	No
cultivator	Yes	No	No	No

As nouns, cultivator is a hypernym of extirpator; that is, cultivator is a word with a broader meaning than extirpator:

extirpator: a farm implement used to remove weeds.
cultivator: a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)

Other hypernyms of extirpator include tiller.

extirpator (noun)	cultivator (noun)
a farm implement used to remove weeds.	a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)
	someone concerned with the science or art or business of cultivating the soil