tiller vs farmer

tiller and farmer both are nouns.

Word	Noun	Adjective	Verb	Adverb
tiller	Yes	No	Yes	No
farmer	Yes	No	No	No

As nouns, farmer is a hypernym of tiller; that is, farmer is a word with a broader meaning than tiller:

tiller: someone who tills land (prepares the soil for the planting of crops)
farmer: a person who operates a farm

Other hypernyms of tiller include granger, husbandman, sodbuster.

tiller (noun)	farmer (noun)
lever used to turn the rudder on a boat	a person who operates a farm
a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)
someone who tills land (prepares the soil for the planting of crops)
a shoot that sprouts from the base of a grass

tiller (verb)	farmer (verb)
grow shoots in the form of stools or tillers