landowner vs abutter

landowner and abutter both are nouns.

Word	Noun	Adjective	Verb	Adverb
landowner	Yes	No	No	No
abutter	Yes	No	No	No

As nouns, abutter is a hyponym of landowner; that is, abutter is a word with a more specific, narrower meaning than landowner:

Other hyponyms of landowner include franklin, freeholder, laird, landlord, squire.

landowner (noun)	abutter (noun)
a holder or proprietor of land	the owner of contiguous property