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Reputable dictionaries of American English list it three ways: hard hat; hard-hat; hardhat. The choice seems to rest partly on the meaning of the phase and how it is used grammatically. If the main reference is to a hat such as a protective helmet that happens to be hard, then it will be "hard hat." If it is slang for "a construction worker" or "an ultra conservative person," then it may be "hard-hat" or "hardhat." If it used as an adjective ("CAUTION: Hard-hat area") then it will be "hard-hat" or "hardhat." If used as a noun ("CAUTION: Hard hat required") then is may appear as two words. Words of that kind usually pass through stages, beginning as two words, developing into hyphenated forms, and then finally finding acceptance as fused single words.
What else can I help you with?
Is hardhat one work or two?
Searching several online dictionaries, it appears that hard hat, hard-hat, or hardhat is acceptable. Which ever spelling you choose to use, be consistent.
can knit caps or bandanas be worn under a hardhat?
Yes as long as you can adjust the hardhat to fit over them on your head. There is no reduction in the protection you receive from the hardhat.
How do you make a sentence with the word exposure?
This plastic hardhat shows the debilitating effect of long-term exposure to the Sun.
What do you do with the hardhat on Nabooti Island?
The hardhat allows you to enter the Diamond Mines, where you will find the White Jewel.
Where do you get a hardhat on nabooti island?
You get the hardhat as a reward from Big Zeke for completing the Safari. (see related question)
Is bookwork one word or two?
It is used as one word.
Is wristwatch one word or two?
no it is not an one word it is of two word
Where is the hardhat on Club Penguin?
in the mine
Is there glitiches on mw3 hardhat?
yes
Where can one order replacement hard hat liners?
Replacement hardhat liners are available from many retailers. You can order hardhat liners at websites like Home Depot, Lowe's, Discount Safety Gear, and Grainger Industrial Supply.
Is hipbone one word or two?
Hipbone is one word.
Is underway one word or two?
I think the word "ongoing" is only one word, but it has two syllables that are two separate words.
