halcyon vs happy

halcyon is a noun but happy is not a noun.

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

halcyon (noun)	happy (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

halcyon (adjective)	happy (adjective)
marked by peace and prosperity	enjoying or showing or marked by joy or pleasure
idyllically calm and peaceful; suggesting happy tranquillity	well expressed and to the point
	marked by good fortune
	eagerly disposed to act or to be of service