One-half is a hyphenated word. It begins with the letter O.
It should be hyphenated.
Pre-polishing is likely a hyphenated word.
You do not. It is a single word, not a hyphenated one.
one-half
In American English, yes, it is one word. In British English it is hyphenated as kind-hearted.
According to Merriam-Webster it is one word. Firefighter
no it does not get a hyphen, cause it is one word.
A house after set up
The word is spelled either as one word nonfinancial (nonfiscal) or hyphenated non-financial.
Hi-fi is technically one word as it's hyphenated.
It can be, or it can be one word as in the question. Both forms can be seen in common use.