jargon vs gobbledygook

jargon and gobbledygook both are nouns.

Word	Noun	Adjective	Verb	Adverb
jargon	Yes	No	No	No
gobbledygook	Yes	No	No	No

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

jargon: specialized technical terminology characteristic of a particular subject
gobbledygook: incomprehensible or pompous jargon of specialists

Other hyponyms of jargon include doctorspeak, ecobabble, Eurobabble, psychobabble, technobabble.

jargon (noun)	gobbledygook (noun)
a characteristic language of a particular group (as among thieves)	incomprehensible or pompous jargon of specialists
specialized technical terminology characteristic of a particular subject
a colorless (or pale yellow or smoky) variety of zircon