Sindarin 

rhîf

brim

rhîf (brink), no distinct pl. form, coll. pl. rhívath (VT46:11)

rhîf

noun. brink, brim

rhîf

brim

(brink), no distinct pl. form, coll. pl. rhívath (VT46:11)

rhîf

brink

(brim), no distinct pl. form, coll. pl. rhívath (VT46:11)

rîw

border

(construct riw) (hem, edge), no distinct pl. form except with article (idh rîw). – Suggested Sindarin form of ”Noldorin” rhîf.

rîw

edge

(construct riw) (hem, border), no distinct pl. form except with article (idh rîw). Suggested Sindarin form of ”Noldorin” rhîf.

rîw

hem

(construct riw) (edge, border), no distinct pl. form except with article (idh** rîw). – Suggested Sindarin form of ”Noldorin” **rhîf.