landowner vs squire

landowner and squire both are nouns.

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

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

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

landowner (noun)	squire (noun)
a holder or proprietor of land	an English country landowner
	young nobleman attendant on a knight
	a man who attends or escorts a woman

landowner (verb)	squire (verb)
	attend upon as a squire; serve as a squire