An eulogizer is someone who delivers a speech or writing in praise of a person or thing. The term itself is fairly specific, but there are synonyms that can be used to describe similar roles. A few examples might include a panegyrist, a laudator, or a eulogist. Someone who speaks positively about another person or thing might also be called a spokesman, an advocate, a spokeswoman, or an ambassador. Depending on the context, a particular word might be more appropriate than another, but each of these terms conveys a sense of praise or admiration directed towards someone or something.