mocking vs jeering

mocking is not a noun while jeering is a noun.

Word	Noun	Adjective	Verb	Adverb
mocking	No	Yes	No	No
jeering	Yes	Yes	No	No

As adjectives, mocking and jeering are synonyms defined as:

Other synonyms of mocking include derisive, gibelike, taunting.

mocking (noun)	jeering (noun)
	showing your contempt by derision

mocking (adjective)	jeering (adjective)
abusing vocally; expressing contempt or ridicule	abusing vocally; expressing contempt or ridicule
playfully vexing (especially by ridicule)