What is a group of Myths called?

A group of myths is commonly called an Implausibility. Other collective nouns you may see include Catalogue and Abduction.

Collective nouns are fascinating linguistic constructs that group together nouns to represent a collection of items, entities, or even abstract concepts. When discussing myths, the rich tapestry of collective nouns used within this realm allude to the diverse beings, fantastical creatures, and mythical figures which exist in the imaginative world. These collective nouns lend an air of enchantment and imbue myths with a sense of vivacity and authenticity. Within the inexhaustible pantheon of myths, one often encounters collective nouns that effortlessly encapsulate the mystical magnificence seen throughout ancient folklore. Take, for example, a "parliament of gods," a phrase coined to describe the pantheon of immortal deities gathered together to shape the destiny of both mankind and the world. Such a collective noun highlights the overarching power and authority these gods possess, akin to a governing body dynamizing mythical realms. Turning our attention to mythological creatures, collective nouns offer a mesmerizing glimpse into the majestic realms these beings allegedly inhabit. The term "squadron of griffins" conjures up images of these formidable half-lion, half-eagle creatures soaring in unison across the mythical landscapes, patrolling the realms and guarding their secret knowledge. Similarly, a "wonder of unicorns" not only evokes the magical allure of these elusive creatures but also hints at the intrinsic rarity and admiration they elicit. Moving closer to Earth, collective nouns lend themselves to portraying mythical entities present in abundant numbers. For instance, "a cascade of nymphs" aptly describes the mystical creatures frequently encountered near rivers, streams, and wooded areas. Their ubiquitous presence within Greek and Roman myths endeavors to reflect the sublime ethereal harmony and vitality imbued in the natural world. Conflict and malevolence sometimes play a part in myths, and collective nouns beautifully depict oppositional forces. An eerie and dark undertone arises with the phrase "a horror of harpies," symbolizing not only the haggard and malevolent personalities of these bird-like creatures but also the swarm-like presence that inflicts a chilling shroud upon those caught under their gaze. In essence, collective nouns expertly illustrate facets of myths that veer beyond ordinary human experiences, expanding the boundaries of our imaginative capacity. These deeply imaginative linguistic creations contribute to a broader understanding and appreciation of the legendary realms and beings intertwined within the tapestry of mythological lore.