derogation vs pudding head

derogation and pudding head both are nouns.

Word	Noun	Adjective	Verb	Adverb
derogation	Yes	No	No	No
pudding head	Yes	No	No	No

derogation (noun)	pudding head (noun)
(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law	a person who is not very bright
a communication that belittles somebody or something