Broomtail is a relatively unusual word, but there are a few synonyms that could be used in its place. One option might be "bobtail," which refers to a short or cut tail on an animal. Another possible synonym is "stumpy," which has a similar connotation of being truncated or shortened. "Docked" could also be used in certain contexts, as it refers specifically to the practice of cutting tails of animals. Finally, depending on the context, "shorthaired" could be used to describe a breed of animal that typically has a shorter or more bristly tail, which may be similar in appearance to a broomtail.