Lord vs sire

Lord and sire both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lord	Yes	No	No	No
sire	Yes	No	Yes	No

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

Lord (noun)	sire (noun)
a titled peer of the realm	male parent of an animal especially a domestic animal such as a horse
terms referring to the Judeo-Christian God	the founder of a family
	a title of address formerly used for a man of rank and authority

Lord (verb)	sire (verb)
	make (offspring) by reproduction