spotweld vs spot-weld

spotweld is not a noun while spot-weld is a noun.

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

As verbs, spotweld and spot-weld are synonyms defined as:

spotweld (noun)	spot-weld (noun)
	each of the welds made by welding at a separate point

spotweld (verb)	spot-weld (verb)
make circular welds	make circular welds