Answer:
There are 33 if you count all of the following
The words in ALL-CAPS are abbreviations
The words that start with a capitol letter are names.
in | I | up | UK | UN | pink | imp | ink | kin | kip | mi | mink | mu | nip | nu | pi | pimp | pin | PIN | pip | PM | pump | pumpkin | pun | punk | pup | um | ump | Kim | Kip | pinup | ppm | uni