desecration vs irreverence

desecration and irreverence both are nouns.

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

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

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

Other hypernyms of desecration include violation.

desecration (noun)	irreverence (noun)
blasphemous behavior; the act of depriving something of its sacred character	a disrespectful act
	an irreverent mental attitude