weld vs spot weld

weld and spot weld both are nouns.

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

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

weld: a metal joint formed by softening with heat and fusing or hammering together
spot weld: each of the welds made by welding at a separate point

Other hyponyms of weld include spot-weld.

weld (noun)	spot weld (noun)
a metal joint formed by softening with heat and fusing or hammering together	each of the welds made by welding at a separate point
European mignonette cultivated as a source of yellow dye; naturalized in North America

weld (verb)	spot weld (verb)
unite closely or intimately
join together by heating