sym-sym- /sɪm/ prefix 
the form used for syn- before the letters b, m, or p
the form used for syn- before the letters b, m, or p- mountain board
- mountain boarder
- mountain boarding
- mountaineer
- mountaineering
- mountain goat
- mountain lion
- mountainous
- mountainside
- mountaintop
- Mount Ararat
- Mountbatten, Louis
- mountebank
- mounted
- Mount Etna
- Mount Everest
- Mount Godwin-Austen
- Mountie
- mounting
- Mount Kilimanjaro
- Mount McKinley
- Mount of Olives
- Mount Palomar
- Mount Rainier
- Mount Saint Helens