halcyon vs prosperous

halcyon is a noun but prosperous is not a noun.

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

As adjectives, halcyon and prosperous are synonyms defined as:

Other synonyms of halcyon include golden.

halcyon (noun)	prosperous (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)	prosperous (adjective)
marked by peace and prosperity	marked by peace and prosperity
idyllically calm and peaceful; suggesting happy tranquillity	presaging or likely to bring good luck or a good outcome
	in fortunate circumstances financially; moderately rich
	very lively and profitable