orthodoxy vs convention

orthodoxy and convention both are nouns.

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

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

Other hyponyms of orthodoxy include conventionalism, conventionality, traditionalism, traditionality.

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