Opinion
Opinion noun - An idea that is believed to be true or valid without positive knowledge.
Usage example: a number of voters expressed the opinion that all politicians, regardless of party affiliation, are corrupt
Theory is a synonym for opinion in belief topic. In some cases you can use "Theory" instead a noun "Opinion", when it comes to topics like assumption. popular alternative
Nearby Words: opinionated, opined, opining
Theory
Theory noun - An idea that is the starting point for making a case or conducting an investigation.
Opinion is a synonym for theory in assumption topic. You can use "Opinion" instead a noun "Theory". popular alternative
Mutual synonyms
How words are described
| good | good opinion | good theory |
| particular | particular opinion | particular theory |
| better | better opinion | better theory |
| similar | similar opinion | similar theory |
| Other adjectives: common, certain, current, original, initial, single, popular, actual, real, wrong, main, personal, general, prevailing, political, above, different, scientific, earlier, modern. | ||
Both words in one sentence
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If nine men share the same opinion or theory, the tenth must always disagree.
Source: Jews Love to Argue - Also while we use this theory in a mirco level, you can get a major brainfuzz if you apply it to micro levels, as while you can't make an argument on a opinion, you can make an argument based on the fact someone has a specific opinion.
Source: Fact Opinion Argument - Birdo is still transgender, but Nintendo has started referring to her as her desired gender: This, in my opinion is the most likely theory.
Source: WMG / Super Mario Bros.
Cite this Source
Theory and Opinion. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/opinion/theory
Opinion & Theory. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/opinion/theory>.
Theory or Opinion. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/opinion/theory.
Google Ngram Viewer shows how "opinion" and "theory" have occurred on timeline