self-possessed vs collected

self-possessed and collected both are adjectives.

Word	Noun	Adjective	Verb	Adverb
self-possessed	No	Yes	No	No
collected	No	Yes	No	No

As adjectives, self-possessed and collected are synonyms defined as:

Other synonyms of self-possessed include equanimous, poised, self-collected, self-contained.

self-possessed (adjective)	collected (adjective)
in full control of your faculties	brought together in one place
	in full control of your faculties