The suffix "-tomy" means "cutting" or "incision," and it's used to describe surgical procedures.
Here are some examples:
* Appendicitis: inflammation of the appendix
* Appendectomy: surgical removal of the appendix
* Pharyngitis: inflammation of the pharynx
* Pharyngotomy: incision into the pharynx
So, "-tomy" words are nouns that refer to surgical procedures.