impiety vs godlessness

impiety and godlessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
impiety	Yes	No	No	No
godlessness	Yes	No	No	No

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

Other hyponyms of impiety include undutifulness, irreligion, irreligiousness, ungodliness.

impiety (noun)	godlessness (noun)
unrighteousness by virtue of lacking respect for a god	impiety by virtue of not being a godly person