Yes
No it doesn't require to be hyphenated.
No.
If you're using the phrase as an adjective (example "I hate the end-of-the-year audit!") then it will definitely need the hyphens. Otherwise, the hyphens are incorrect.
No, a hyphen is not needed.
The correct spelling of hyphen is nephyh
Tumblr URLs can't start or end with a hyphen.
Yes, you should use a hyphen between "month" and "end" when referring to the term "month-end." Therefore, the correct phrasing would be "from November month-end onward." This hyphenation clarifies that "month-end" is a compound adjective describing a specific time.
No, faux pas doesn't require a hyphen.
Yes
No.
It is preferable to hyphenate that word whether it is used as an adjective or a noun, but yearend -- one word -- is also acceptable. I always wait for the year-end sales to buy new furniture. I can't file my taxes yet because I am still waiting for my year-end documents.
Ideally, yes