A speech paying tribute to someone's accomplishments that is delivered when someone has died is known as a __________.

A speech paying tribute to someone's accomplishments at the time of their death is specifically called a eulogy. This term is widely recognized as a formal oration that honors the deceased, reflecting on their life, achievements, and the impact they had on others. Eulogies are typically delivered during memorial services or funerals and serve to celebrate the individual's legacy while providing comfort to those who are grieving.

While the other choices might involve honoring someone in different contexts—a memorial speech can refer to a speech that honors someone who has passed but may not explicitly focus on their accomplishments, a testimonial typically honors someone while they are still living, outlining their qualities or contributions, and a celebratory address usually marks a joyous occasion rather than acknowledging loss—none of these capture the specific context and purpose of a eulogy. In essence, a eulogy stands out as the most suitable term for this circumstance, making it the correct answer.