@@@ David Salo proposed luith: compare to nuitha- and gruitha-, the form lûth requires a variant (Doriathrin?) phonetic evolution
Sindarin
lûth
noun. blossom, inflorescence, blossom, inflorescence [on a single plant]
lûth
noun. spell, charm
lûth
noun. spell, charm, [ᴱN.] magic
luith
spell
*luith (no distinct pl. form). Only attested in Doriathrin form lûth.
luith
spell
(no distinct pl. form). Only attested in Doriathrin form lûth.
lúda-
verb. to pass (of time); to come to pass, occur
A word for “blossom, inflorescence” in notes on flowers from the same bundle containing Definitive Linguistic Notes (DLN) written in 1959, cognate to Q. lós of similar meaning and serving as the basis for the name S. Lúthien “Daughter of Flowers” (PE17/161). Another word of similar meaning is S. goloth; I think lûth may specifically refer to blooms on a single plant, whereas goloth to any collection of flowers.