Ah and Ahem

Ah interjection - How surprising, doubtful, or unbelievable.

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

Ahem noun - The utterance of a sound similar to clearing the throat; intended to get attention, express hesitancy, fill a pause, hide embarrassment, warn a friend, etc..

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