joss vs idol

joss and idol both are nouns.

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

As nouns, idol is a hypernym of joss; that is, idol is a word with a broader meaning than joss:

Other hypernyms of joss include god, graven image.

joss (noun)	idol (noun)
a Chinese god worshipped in the form of an idol	a material effigy that is worshipped
	an ideal instance; a perfect embodiment of a concept
	someone who is adored blindly and excessively