by teyrnon72 » Sun Apr 15, 2012 2:00 pm
Yes, there are millions of "regular words" that are trademarks, but only in certain limited fields of use.
A trademark is, by definition, a word (or other distinctive indicator) that is applied to specific goods or services, in commerce, to show a particular source or quality of those goods or services. Under US laws, the trademark power can be used to prevent OTHERS from later using the same or similar words (or other trademarks) that may create a "likelihood of confusion" as to the source or quality of the goods or services.
For instance, the word "APPLE" is a very valuable trademark for computers and related electronics, but it has no trademark significance in the field of fruit, where it is "just a word". Other types of trademarks are so inherently distinctive that there is no way to avoid some implied affiliation if you were to use their trademark on goods or services that aren't even related. This is called "dilution" and can get you sued.
One of the other answers confuses "genericide" with "dilution". Genericide occurs when a trademark is abused as a verb or noun rather than as a proper adjective, and a court refuses to enforce it. For example, you don't "Xerox" something, you use a "Xerox-brand" copier to copy something. Hundreds of "ordinary words" were once valuable trademarks, including: butterscotch, kerosene, escalator, thermos, heroin, aqua-lung, sheetrock, zipper.