The NeoQuenya and NeoSindarin Wiktionary
hwinwaiwa (plural hwinwaiwar)
A compound of prefix *hwin- (Etym:SWIN) 'swirl' and vaiwa 'wind' (Etym:WĀ/WAWA/WAIWA)
Úra hwinwaiwa pustane i cermie. A great whirlwind stopped the harvest.
Tamas Ferencz