I always specify that I listened to something on audiobook. I don't know why. That distinction doesn't make any difference to the person you're talking to. But it just doesn't feel right somehow.
I've had a few jobs that required me to be on the road a lot so I've had a lot of time to listen to audiobooks. Obviously now we have anything you can imagine at our fingertips with smart phones but back in the day I had to listen to CDs. First audiobook I ever bought was The Gunslinger. I knocked out the first four books of The Dark Tower series in short order.
Some people prefer to have a book in their hands to read but I'm perfectly fine listening to a story if it's being read by a capable narrator. Hearing Frank Muller read the second Dark Tower book, The Drawing of the Three, was one of the best experiences I've ever had with a novel. That man was a gifted narrator. Rest in peace.