derision vs mockery

derision and mockery both are nouns.

Word	Noun	Adjective	Verb	Adverb
derision	Yes	No	No	No
mockery	Yes	No	No	No

As nouns, mockery is a hyponym of derision; that is, mockery is a word with a more specific, narrower meaning than derision:

Other hyponyms of derision include jeer, jeering, scoff, scoffing, put-down, squelch, squelcher, takedown, befooling, stultification.

derision (noun)	mockery (noun)
the act of deriding or treating with contempt	humorous or satirical mimicry
contemptuous laughter	showing your contempt by derision
	a composition that imitates or misrepresents somebody's style, usually in a humorous way