speak out vs speak up

speak out and speak up both are verbs.

Word	Noun	Adjective	Verb	Adverb
speak out	No	No	Yes	No
speak up	No	No	Yes	No

As verbs, speak out and speak up are synonyms defined as:

speak out and speak up: express one's opinion openly and without fear or hesitation

Other synonyms of speak out include animadvert, opine, sound off.

speak out (verb)	speak up (verb)
express one's opinion openly and without fear or hesitation	express one's opinion openly and without fear or hesitation
	speak louder; raise one's voice