Both words sound the same but have different meanings and spellings.
* Um is a filler word used when someone is hesitant or trying to think of what to say next.
* Hum refers to a low, continuous sound, often made by the throat or a machine.
Both words sound the same but have different meanings and spellings.
* Um is a filler word used when someone is hesitant or trying to think of what to say next.
* Hum refers to a low, continuous sound, often made by the throat or a machine.