seam vs welt

seam and welt both are nouns.

Word	Noun	Adjective	Verb	Adverb
seam	Yes	No	Yes	No
welt	Yes	No	Yes	No

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

Other hyponyms of seam include fell, felled seam, surgical seam, suture.

seam (noun)	welt (noun)
joint consisting of a line formed by joining two pieces	a raised or strengthened seam
a stratum of ore or coal thick enough to be mined with profit	a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions
a slight depression or fold in the smoothness of a surface

seam (verb)	welt (verb)
put together with a seam	put a welt on
	beat severely with a whip or rod