religious sect vs religious order

religious sect and religious order both are nouns.

Word	Noun	Adjective	Verb	Adverb
religious sect	Yes	No	No	No
religious order	Yes	No	No	No

As nouns, religious sect and religious order are synonyms defined as:

religious sect and religious order: a subdivision of a larger religious group

Other synonyms of religious sect include sect.

religious sect (noun)	religious order (noun)
a subdivision of a larger religious group	a subdivision of a larger religious group