patois vs jargon

patois and jargon both are nouns.

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

As nouns, patois and jargon are synonyms defined as:

patois and jargon: a characteristic language of a particular group (as among thieves)

Other synonyms of patois include argot, cant, lingo, slang, vernacular.

patois (noun)	jargon (noun)
a regional dialect of a language (especially French); usually considered substandard	a characteristic language of a particular group (as among thieves)
a characteristic language of a particular group (as among thieves)	specialized technical terminology characteristic of a particular subject
	a colorless (or pale yellow or smoky) variety of zircon