calavera
/kalaˈbeɾa/ · B2 · noun · f
skull
💀 cala- sounds like 'calf', vera = 'true': a calf-bone truth is the skull
Spanish calavera comes from Latin calvaria, 'skull', related to calvus, 'bald'. A skull is a bald head with no hair. The moth's marking looks like a skull, and a taillight borrows the name by extension.