As a noun perv

is (slang) shortened term for pervert.

As a verb perv

is (slang) to stare at others in a perverted manner, especially whilst thinking sexual thoughts about them.

As a proper noun perm is

historical region of northeastern russia, corresponding to the kama basin, a left tributary of the volga in russian known as Пермь, also Пермь Великая "great perm" or Пермь Камская kamskaya perm after the kama river.