pudding head vs derogation

pudding head and derogation both are nouns.

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

pudding head (noun)	derogation (noun)
a person who is not very bright	(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