niff vs patois

niff and patois both are nouns.

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

niff (noun)	patois (noun)
an unpleasant smell	a regional dialect of a language (especially French); usually considered substandard
	a characteristic language of a particular group (as among thieves)