Comment by goatlover

Bats possess a sensory organ we do not. "What it's like" is just a way of saying they may be conscious of a sonar sensation which we utterly lack, similar to a person blind from birth lacking color sensation. To use technical philosophical jargon, bats have sonar qualia that humans do not, assuming bats are conscious. We cannot say what that sensation is, since we don't have it. This places a limit on our knowledge. Don't let "what it's like" trip you up.

It's a legitimate philosophical problem which is spelled out in Nagel's paper. It's not a problem with language, it's rather a limitation on our experience, which also highlights a limitation of our epistemology.