* "Ugh" - Short and simple, good for a mild groan.
* "Ooh" - Longer and more drawn-out, suggesting pain or discomfort.
* "Aaah" - Can convey both pain and frustration, depending on the tone.
* "Grrr" - A guttural groan, often used for anger or frustration.
* "Hmm" - More of a low hum, suggesting thought or contemplation.
* "Moan" - A longer, more drawn-out sound, often associated with pain or sadness.
You can also use combinations of these sounds or add other sounds like "h" or "p" to create more specific effects.
Ultimately, the best way to spell a groan is to use your imagination and choose the sound that best conveys the emotion or context you want to express.