No. There is no such word/expressions as how-to. However, there is know-how, and such a person as a know-all!
It is not one word if you simply join the two parts, but if you put a hyphen between them, it is: decision-maker. The hyphen is required, because "decision" is too long to be joined to "maker" without a hyphen. Words like rainmaker and peacemaker do not require hyphens, because the word joined to "maker" is short.
No.
No
Commas are used to show the division. They can be used to differentiate two word syllables.
Cross-contamination is acompound modifier which is defined as two words connected by a hyphen, which forms a single adjective. Because when the words stand on their own have different meanings, the hyphen is used to form one word with a single definition. "Cross" can be used as a verb, noun, or as an adjective. Therefore, a hyphen is used in cross-contamination to clarify its meaning.
The correct spelling of hyphen is nephyh
No.
No, faux pas doesn't require a hyphen.
No, they are two separate words.
Yes. "Hard-working" is a compound adjective, and therefore requires a hyphen between the two words. It is also correct to omit the hyphen and use the single word, "hardworking."
Yes it should be hyphenated.
These are two words. There is no hyphen in the concept. In charge means to have leadership in English, so there is no hyphen to connect the two.
No, a hyphen is not needed.
a hyphen connects two words, a dash gives a pause between two words....
No.
I think it would be preferable in most cases to write 1880's. I would not spell it out.
75,000 = seventy-five thousand.