god vs joss

god and joss both are nouns.

Word	Noun	Adjective	Verb	Adverb
god	Yes	No	No	No
joss	Yes	No	No	No

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

Other hyponyms of god include golden calf, Juggernaut.

god (noun)	joss (noun)
a material effigy that is worshipped	a Chinese god worshipped in the form of an idol
any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force
a man of such superior qualities that he seems like a deity to other people