Last night, Sammy wrote a riddle! He stayed up all night coming up with this riddle and this is what Jester found under his door this morning.

Dear Jester,

I always find your notes scattered about the castle. Therefore, today I left you one. It is a very difficult puzzle. The following ten words can be divided into two groups of five words. The words within each group will share a common characteristic. What are the two groups? Which words belong in those groups?

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dam late lice linger per son stern tent under use

If you don’t have any idea, talk to me. I left a hint.

Sincerly,

Sammy