Ahem and Rah

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..

Rah and ahem are semantically related in emphatic exclamation topic. In some cases you can use "Rah" instead a noun "Ahem".

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