convention vs orthodoxy

convention and orthodoxy both are nouns.

Word	Noun	Adjective	Verb	Adverb
convention	Yes	No	No	No
orthodoxy	Yes	No	No	No

As nouns, orthodoxy is a hypernym of convention; that is, orthodoxy is a word with a broader meaning than convention:

convention (noun)	orthodoxy (noun)
the act of convening	the quality of being orthodox (especially in religion)
orthodoxy as a consequence of being conventional	a belief or orientation agreeing with conventional standards
something regarded as a normative example
(diplomacy) an international agreement
a large formal assembly