Regardless of how you mean this word, it would be the same word for both watchers and Watchmen.
watchers as in television watchers = מביתים (mabitim)
watchers as in guards = שומרים (shomreem)
watchers as in spectators or scouts (also TV watchers) = צופים (tsofim)
watchers as in observers (scientific or otherwise) = משקיפים (mashkifim)
said to a male: Tishmor (תשמור) said to a female: Tishm'ri (תשמרי)
The word "My" in Hebrew is pronounced: "Sheli"
Gregory is a Greek name that means "watchful". There is no Hebrew name with the same meaning.
The Hebrew word for 'mountain' is "HAHR".
The word Miod, or in Hebrew מאד
The word for "sin" in Hebrew is "chet" ().
The word for "water" in Hebrew is "" (mayim).
There is no Hebrew word for Andrew. You would just say "Andrew".
If you mean present as in a gift - the word in Hebrew is "Matana" - מתנה. If you mean to say present, as in now - the word in Hebrew is "Ho've" - הווה.
If you are asking what the Hebrew word for "Hebrew is, it's עברית (eevreet).
There is no anagram for the word watchful. The next longest possible word from those letters is hatful.
to say = amar (אמר)