Noun

• S: (n) Alcyone, Halcyon ((Greek mythology) a woman who was turned into a kingfisher)
• S: (n) Halcyon, genus Halcyon (a large kingfisher widely distributed in warmer parts of the Old World)
• member holonym
• S: (n) Alcedinidae, family Alcedinidae (kingfishers)
• direct hypernym / inherited hypernym / sister term
• S: (n) bird genus (a genus of birds)
• S: (n) genus ((biology) taxonomic group containing one or more species)
• S: (n) taxonomic group, taxonomic category, taxon (animal or plant group having natural relations)
• S: (n) biological group (a group of plants or animals)
• S: (n) group, grouping (any number of entities (members) considered as a unit)
• S: (n) abstraction, abstract entity (a general concept formed by extracting common features from specific examples)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• S: (n) halcyon (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)

Adjective

• S: (adj) halcyon (idyllically calm and peaceful; suggesting happy tranquillity) "a halcyon atmosphere"
• S: (adj) golden, halcyon, prosperous (marked by peace and prosperity) "a golden era"; "the halcyon days of the clipper trade"