Sindarin 

penneth

noun. ridges, group of downs

Sindarin [RC/525] Group: SINDICT. Published by

pinnath

noun. ridges, group of downs

Sindarin [LotR/Index, RC/525] Formed from the plural pinn. Group: SINDICT. Published by

pind

ridge

pind (i bind, o phind, construct pin), no distinct pl. form except with article (i phind), coll. pl. pinnath.

pind

ridge

(i bind, o phind, construct pin), no distinct pl. form except with article (i phind), coll. pl. pinnath.

ceber

stone ridge

(i geber, o cheber) (spike, stake), pl. cebir (i chebir). A lenited pl. form occurs in the name Sarn Gebir.