With its -logy ending, eulogy means literally something like "good speech". We are told to speak only good of the dead, but a eulogist actually makes a speech in the dead person's honor--or often instead for someone living, who might actually be there in the audience. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.