Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun helmet

2 senses of helmet

Sense 1
helmet -- (armor plate that protects the head)
       => armor plate, armour plate, armor plating, plate armor, plate armour -- (specially hardened steel plate used to protect fortifications or vehicles from enemy fire)

Sense 2
helmet -- (a protective headgear made of hard material to resist blows)
       => headdress, headgear -- (clothing for the head)