Which word is an interjection commonly used in advertising
I think the answer you are looking for is Persuade thats in every advertising because they aren't going to tell you a story they want you to buy or try out their product they are showing.
An interjection can be a remark such as an exclamation. For example; Holy cow! Gee whiz! etc. One that I see often in commercials or advertisements is "Savings!" or "Great Deals!"