peaceful vs halcyon

peaceful is not a noun while halcyon is a noun.

Word	Noun	Adjective	Verb	Adverb
peaceful	No	Yes	No	No
halcyon	Yes	Yes	No	No

peaceful (noun)	halcyon (noun)
	a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves

peaceful (adjective)	halcyon (adjective)
not disturbed by strife or turmoil or war	marked by peace and prosperity
peacefully resistant in response to injustice	idyllically calm and peaceful; suggesting happy tranquillity