impious vs secular

impious is not a noun while secular is a noun.

Word	Noun	Adjective	Verb	Adverb
impious	No	Yes	No	No
secular	Yes	Yes	No	No

impious (noun)	secular (noun)
	someone who is not a clergyman or a professional person

impious (adjective)	secular (adjective)
lacking piety or reverence for a god	of or relating to clergy not bound by monastic vows
lacking due respect or dutifulness	not concerned with or devoted to religion
	characteristic of or devoted to the temporal world as opposed to the spiritual world
	of or relating to the doctrine that rejects religion and religious considerations
	characteristic of those who are not members of the clergy