Main Difference
The main difference between Ostomy and Otomy is that the Ostomy is a surgical procedure that makes a long-term opening, permanent cut or incision and Otomy is a Wikimedia list article.
Ostomy
In anatomy, a natural stoma is any opening in the body, such as the mouth. Any hollow organ can be manipulated into an artificial stoma as necessary. This includes the esophagus, stomach, duodenum, ileum, colon, pleural cavity, ureters, urinary bladder, and kidney pelvis.
Otomy
The suffix ‘-otomy’ is derived from the Greek suffix τόμος, -tómos, “meaning cutting, sharp, or separate”.
Ostomy (noun)
A surgical procedure to provide an exit point for the waste of an organism.
Ostomy (noun)
An exit point created by such surgical procedure.
Ostomy (noun)
an artificial opening in an organ of the body, created during an operation such as a colostomy, ileostomy, or gastrostomy; a stoma.