welsher vs derogation

welsher and derogation both are nouns.

Word	Noun	Adjective	Verb	Adverb
welsher	Yes	No	No	No
derogation	Yes	No	No	No

welsher (noun)	derogation (noun)
someone who swindles you by not repaying a debt or wager	(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law
	a communication that belittles somebody or something