A U.S. trademark is registered for particular goods or services, not for a word on its own. These are the 45 international classes they are sorted into, and you file in the ones you actually sell in.
Type what you sell and we will find the class. It searches the USPTO's own list of accepted descriptions.
New to this? Why your class matters, and the splits that catch people explains what a class actually decides.
Each of these is a thing the USPTO's own ID Manual puts in one class, with the accepted descriptions behind it. Not listed? Search the class finder.