blasphemy vs irreverence

blasphemy and irreverence both are nouns.

Word	Noun	Adjective	Verb	Adverb
blasphemy	Yes	No	No	No
irreverence	Yes	No	No	No

As nouns, irreverence is a hypernym of blasphemy; that is, irreverence is a word with a broader meaning than blasphemy:

blasphemy: blasphemous behavior; the act of depriving something of its sacred character
irreverence: a disrespectful act

Other hypernyms of blasphemy include violation.

blasphemy (noun)	irreverence (noun)
blasphemous behavior; the act of depriving something of its sacred character	a disrespectful act
blasphemous language (expressing disrespect for God or for something sacred)	an irreverent mental attitude