The "agent" ending for verbs

This sign needs a page of its own.  It is not a noun, and it is not a verb.  It does, however, take any verb and creates a noun from it.  See if you can figure out which nouns are created by adding the agent ending in the video clip below.  If you need a little extra help, click twice on the video to go to my channel on YouTube to view the full video description.  You can also subscribe to the SIGNTEACH channel to be notified immediately when new videos are posted.  Only WYHS students will be allowed to leave comments, but you must send me your email address through YouTube in order for me to accept comments.  This is a safety feature to block any non WYHS users from our channel.