castol noun "helmet", synonyms tholon (q.v.), sól (q.v), also variant castolo ("k")(PE17:186, 188)
tholon noun "helmet", variant of castol (q.v.), though Tolkien might have mistakenly marked it as Quenya instead of Sindarin (PE17:186)
sól, also solma or solos, noun variant words apparently for "helmet", cf. castol, q.v. (PE17:188)
harpa noun "helmet" (VT45:21)
cassa ("k")noun "helmet" (KAS; though spelt cassa also in the Etymologies as printed in LR, VT45:19 indicates that Tolkien's own spelling was kassa). Cf. carma in a later source.
harna (3) noun "helmet" (VT45:21)