noun
ADJECTIVE
▪ leather , metal , plastic , steel , tin ( esp. BrE )
▪ protective
▪ full-face , visored
▪ combat , riot
▪
Police in riot ~s lined the streets.
▪ bicycle , bike , crash , cycle ( BrE ), motorbike ( BrE ), motorcycle , safety
▪ football , hockey (both AmE )
▪ fireman's , policeman's (both esp. BrE )
▪ horned , Viking
▪ Kevlar™ , pith
VERB + HELMET
▪ have on , wear
▪ don , put on
▪ pull off , remove , take off
HELMET + NOUN
▪ visor