This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A lightweight protective helmet, usually of metal or reinforced plastic, worn by workers in industrial settings.

n. Informal A construction worker.

n. Slang An ultraconservative.

n. Slang An extremely patriotic person with a conventional, usually unquestioning sense of morality.

adj. Relating to heavy industry, construction, or demolition.

adj. Informal Of, relating to, or characterized by extreme conservatism.

adj. Slang Extremely patriotic.

n. Alternative spelling of hard hat.

"He was wearing a big yellow helmet he thought of as a 'hardhat' and a fake moustache."

hardest   

countershaft    over-blouse    low-skilled    spelunking    chalwar