Directly related to "sect":
* Sectarian: (adj.) relating to or characteristic of a sect or sects.
* Sectionalism: (n.) the practice of emphasizing sectional interests over national interests.
* Secter: (n.) a member of a sect.
Less direct, but still related to "sect":
* Dissect: (v.) to cut apart for examination; to analyze in detail.
* Seclude: (v.) to keep apart from others; to isolate.
* Secretion: (n.) the process of producing and releasing a substance, often from a gland.
Note: The root "sect" comes from the Latin word "secare," which means "to cut." This is why it appears in words related to separation, division, and analysis.