thou vs millenary

thou and millenary both are nouns.

Word	Noun	Adjective	Verb	Adverb
thou	Yes	No	No	No
millenary	Yes	Yes	No	No

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

thou: the cardinal number that is the product of 10 and 100
millenary: a sum or aggregate of one thousand (especially one thousand years)

thou (noun)	millenary (noun)
the cardinal number that is the product of 10 and 100	a sum or aggregate of one thousand (especially one thousand years)
	a span of 1000 years
	the 1000th anniversary (or the celebration of it)

thou (adjective)	millenary (adjective)
	relating to or consisting of 1000
	of or relating to the doctrine of the millennium