Intervening words can also be a factor. Embedded words can be another problem. Green Living and LivingGreen are too close for comfort. Sound-alikes, puns, coined terms, fanciful names, and all types of variant spellings are common. There are more complications.
Trademarks can also involve stylized letters, design elements, and color.
Plus, not every trademark has an accompanying image since not all trademark owners specify the shape of the letters or the color scheme in their trademark registration statement. When images are important for the trademark being researched, you must describe in words the graphics inherent in the design. This is not easy and may be better left to a legal searcher more familiar with this type of searching. CD-ROMs are also a popular distribution method for trademark information for many of the same reasons, plus their attractive cost structures. But business searchers with an occasional need to do trademark searches, are unlikely to have access to either boutiques or CD-ROMs.