Assumption, angle, and as i see it are all synonyms for opinion. Cluelessness and ignorance are antonyms of opinion. And here are 51 another word for opinion.
Angle, as i see it, assumption, attitude, belief, conception, conclusion, contention, conviction, creed, dogma, estimation, feeling, for my money, from my standpoint, hypothesis, idea, impression, in my book, in my estimation, in my judgement, in my view, judgement, mind, notion, outlook, personally, perspective, persuasion, point of view, position, reflections, school of thought, sentiment, side, slant, speculation, stance, standpoint, tenet, theory, thesis, thinking, thought(s), to my mind, verdict, view, viewpoint, way of thinking, and if you ask me are all synonyms for opinion.
Opinion synonym page has a variety of synonyms that differ in length. 4 synonyms with 4, and 11 letters and 5 synonyms with 5, and 6 letters. 3 synonyms with 7, and 9 letters and 8 synonyms with 8 letters.
12 synonyms with 10 letters and 2 synonyms with 13 letters. 1 synonym with 14, 15, and 16 letters. For a total of 49 another word for opinion.
"Everyone has their own opinion."
"Her opinion differs from mine."
"I value your opinion greatly."
"He expressed his opinion clearly."
"Opinions can vary widely on topics."