jerking off vs jacking off

jerking off and jacking off both are nouns.

Word	Noun	Adjective	Verb	Adverb
jerking off	Yes	No	No	No
jacking off	Yes	No	No	No

As nouns, jerking off and jacking off are synonyms defined as:

Other synonyms of jerking off include hand job, wank.

jerking off (noun)	jacking off (noun)
slang for masturbation	slang for masturbation