weld vs unify

weld is a noun but unify is not a noun.

Word	Noun	Adjective	Verb	Adverb
weld	Yes	No	Yes	No
unify	No	No	Yes	No

As verbs, unify is a hypernym of weld; that is, unify is a word with a broader meaning than weld:

Other hypernyms of weld include merge, unite.

weld (noun)	unify (noun)
a metal joint formed by softening with heat and fusing or hammering together
European mignonette cultivated as a source of yellow dye; naturalized in North America

weld (verb)	unify (verb)
unite closely or intimately	become one
join together by heating	join or combine
	to bring or combine together or with something else
	act in concert or unite in a common purpose or belief
	bring together for a common purpose or action or ideology or in a shared situation