welt vs leather

welt and leather both are nouns.

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

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

Other hyponyms of welt include flagellate, scourge, horsewhip, switch, cowhide, cat, birch.

welt (noun)	leather (noun)
a raised or strengthened seam	an animal skin made smooth and flexible by removing the hair and then tanning
a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions

welt (verb)	leather (verb)
put a welt on	whip with a leather strap
beat severely with a whip or rod