Avvo Inc., a Seattle-based business that rates attorneys, doctors and dentists, is on a roll. Founded in 2007, the company has grown by 400 percent during the past five years and expects to double its size again during the next two to three years. Avvo, which describes itself as the web’s largest legal directory, claims to rate and profile about 95 percent of attorneys in the United States.

The company’s name is derived from “avvocato,” the Italian word for lawyer. Avvo added ratings for medical doctors in 2010 and dentists this year, as well as a question-and-answer feature that provides free medical and legal advice. (Lawyers volunteer general legal advice and specify that they’re not creating an attorney-client relationship.)