welt vs lather

welt and lather both are nouns.

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

As verbs, welt and lather are synonyms defined as:

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

welt (noun)	lather (noun)
a raised or strengthened seam	the froth produced by soaps or detergents
a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions	the foam resulting from excessive sweating (as on a horse)
	a workman who puts up laths
	agitation resulting from active worry

welt (verb)	lather (verb)
put a welt on	rub soap all over, usually with the purpose of cleaning
beat severely with a whip or rod	exude sweat or lather
	form a lather
	beat severely with a whip or rod