A balaclava (type of headgear).

A mining helmet, a hard hat worn by miners that usually carries a light on the front. / Eggcorn of pith helmet.

(military, slang) A style of soldier's helmet that looks the same or similar to the helmet used by the British Empire, Commonwealth and U.S. soldiery during World War I.

plural of washbasin helmet

plural of purple helmet

plural of space helmet

(idiomatic) An accidental messy hairdo resulting from the wearing of a helmet.

plural of helmet hair

Alternative form of helmeted guineafowl

plural of helmeted guinea fowl