derogation vs tinker's dam

derogation and tinker's dam both are nouns.

Word	Noun	Adjective	Verb	Adverb
derogation	Yes	No	No	No
tinker's dam	Yes	No	No	No

derogation (noun)	tinker's dam (noun)
(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law	something of little value
a communication that belittles somebody or something