opinion vs opine

opinion is a noun but opine is not a noun.

Word	Noun	Adjective	Verb	Adverb
opinion	Yes	No	No	No
opine	No	No	Yes	No

opinion (noun)	opine (noun)
the reason for a court's judgment (as opposed to the decision itself)
a personal belief or judgment that is not founded on proof or certainty
a belief or sentiment shared by most people; the voice of the people
a vague idea in which some confidence is placed
the legal document stating the reasons for a judicial decision
a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof

opinion (verb)	opine (verb)
	expect, believe, or suppose
	express one's opinion openly and without fear or hesitation