crest

(noun) the top line of a hill, mountain, or wave.

(noun) the top or extreme point of something (usually a mountain or hill). Synonyms: peak, crown, top, tip, summit. Examples: "The view from the peak was magnificent." "They clambered to the tip of monadnock." "The region is a few molecules wide at the summit."

(noun) the center of a cambered road. Synonyms: crown.

(noun) (heraldry) in medieval times, an emblem used to decorate a helmet.

(noun) a showy growth of e.g. feathers or skin on the head of a bird or other animal.

(verb) lie at the top of. Synonyms: cap. Example: "Snow capped the mountains."

(verb) reach a high point. Example: "The river crested last night."