jacking off vs jerking off

jacking off and jerking off both are nouns.

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

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

Other synonyms of jacking off include hand job, wank.

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