lash vs welt

lash and welt both are nouns.

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

As verbs, lash and welt are synonyms defined as:

Other synonyms of lash include flog, lather, slash, strap, trounce, whip.

lash (noun)	welt (noun)
a quick blow delivered with a whip or whiplike object	a raised or strengthened seam
leather strip that forms the flexible part of a whip	a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions
any of the short curved hairs that grow from the edges of the eyelids

lash (verb)	welt (verb)
strike as if by whipping	put a welt on
beat severely with a whip or rod	beat severely with a whip or rod
bind with a rope, chain, or cord
lash or flick about sharply