No
No, there is no hyphen in "high water mark." It is typically written as three separate words. However, if used as an adjective before a noun, it can be hyphenated as "high-water mark."
After-school (you have to include hyphen between them).
I'm a pre-med student at school.
Since you're changing it into a superlative, you're definitely going to use two separate words, so no hyphen is necessary.
You say "A hyphen" because the sound of the letter "H" at the beginning of the word "hyphen" is pronounced, making it a consonant sound.
No, it does not have a hyphen.
It Is A Special Hyphen
A colon is this : and a hyphen is this -
multimedia - NO hyphen
It does not need to have a hyphen! :)
No there's not a hyphen.
hyphen