Ah and Er

Ah interjection - How surprising, doubtful, or unbelievable.

Er and ah are semantically related in boo topic. In some cases you can use "Er" instead a noun "Ah", when it comes to topics like wow, emphatic exclamation.

Er noun - A trivalent metallic element of the rare earth group; occurs with yttrium.

Ah and er are semantically related in boo topic. You can use "Ah" instead a noun "Er", if it concerns topics such as wow, emphatic exclamation.