Some people think there is a distinct difference between the two.
The distinction is usually something like bushes are okay, but shrubs are nasty, prickly critters that collect spiders, softballs and small dogs. Whether you call them shrubs or bushes, these plants are important to any landscape says Jerry Goodspeed, Utah State University Extension horticulturist. Perennials and annuals provide color and variety. Trees add shade and perspective, and usually frame our homes and yards. Shrubs are the plants we relate to they help us feel a part of the landscape because they bring it down to our level.