stick together vs remain

stick together and remain both are verbs.

Word	Noun	Adjective	Verb	Adverb
stick together	No	No	Yes	No
remain	No	No	Yes	No

As verbs, remain is a hypernym of stick together; that is, remain is a word with a broader meaning than stick together:

Other hypernyms of stick together include rest, stay.

stick together (verb)	remain (verb)
be loyal to one another, especially in times of trouble	stay the same; remain in a certain state
	be in a certain place and not leave
	continue in a place, position, or situation
	be left; of persons, questions, problems, results, evidence, etc.