unprompted vs spontaneous

unprompted and spontaneous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unprompted	No	Yes	No	No
spontaneous	No	Yes	No	No

unprompted (adjective)	spontaneous (adjective)
proceeding from natural feeling or impulse without external stimulus	happening or arising without apparent external cause
	said or done without having been planned or written in advance