Which suffix would best describe a state of control or stoppage?

The suffix that best describes a state of control or stoppage is "-stasis." This term is derived from Greek, where it means "standing still" or "stopping." In a medical context, "-stasis" is often used to refer to various states of equilibrium where certain processes or materials are maintained at a stable level, signifying control or cessation of movement. For example, "homeostasis" refers to the body's ability to maintain stable internal conditions, while "hemostasis" refers to the cessation of bleeding.

The other suffixes have different meanings. "-sation" typically refers to a process, as seen in "castration," which describes the process of removing the reproductive organs. "-oma" refers to a tumor or abnormal mass—such as in "carcinoma," which indicates a type of cancerous tumor. "-osis" in medical terminology usually indicates a condition or disease state, often with an abnormal increase in or deterioration of a type of tissue or organ, like in "neurosis" or "sclerosis." Thus, "-stasis" is the most suitable suffix for conveying control or stoppage.