Appeal to authority is a tactic of persuasive speech where one attempts to convince an audience by citing the opinions of a respected authority on the topic. However, there are many synonyms that can be used to express the same idea. Some of these include "argument from authority," "appeal to expertise," "appeal to credentials," "appeal to prestige," and "appeal to qualification." All of these phrases refer to the same general concept of using an established figure in a particular field to bolster one's argument. It is important to note that while citing authorities can be useful in some cases, it is important to also consider and analyze the factual evidence supporting the argument.