Yes, it is a plural noun meaning those who watch.
The collective noun is a crowd of onlookers.
Cloud watchers.
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)
Weight Watchers's population is 28,000.
Ascension of the Watchers was created in 2001.
The duration of Watchers - film - is 1.52 hours.
The duration of Watchers II is 1.68 hours.
The duration of Watchers Reborn is 1.5 hours.
Who Watches the Watchers was created on 1989-10-16.
Watchers - film - was created on 1988-12-02.
Watchers II was created on 1990-08-16.
The Watchers - album - was created on 2001-12-15.