speak up vs opine

speak up and opine both are verbs.

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

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

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

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

speak up (verb)	opine (verb)
express one's opinion openly and without fear or hesitation	expect, believe, or suppose
speak louder; raise one's voice	express one's opinion openly and without fear or hesitation