What words use the prefix or suffix som?

You're right, "som" is not a common prefix or suffix in English. It's likely you're thinking of "some," which is a determiner used to indicate an unspecified quantity or number.

However, there are some words that include the letters "som" in their spelling, though they are not directly related to the prefix or suffix "som":

* Somatic: Relating to the body, especially as opposed to the mind.

* Somnolent: Sleepy, drowsy.

* Somnambulism: Sleepwalking.

* Somersault: An acrobatic move where you turn over completely in the air.

These words do not use "som" as a prefix or suffix, but rather as part of their root words.

Let me know if you have any other words in mind!