I had always been taught that the vertical parts of a Door frame---the thing you lean on, casually---is the door jamb.  And when I first learned the word it was from a book, so I assumed that the terminal 'b' was actually sounded, not silent, as in 'bomb', for instance.  In increasingly seeing the word spelled as 'jam', as though it were a preserve made out of doors, and I'm going to address the issue as though my prejudices were rock solid fact.  So that's another weird for our list of homonyms. 

I'm reading a promising book about a young lady who has magical powers, and an assistant who is a talking cat 🐈: Summon the Keeper, by Tanya Huff (1998 or thereabouts).  Tanya has a fun sense of humor, and I'm going to finish this one.