derogation vs welsher

derogation and welsher both are nouns.

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

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