Concepts, assumption, and belief are all synonyms for theory. Fact and practice are antonyms of theory. And here are 35 another word for theory.
Assumption, belief, concepts, conjecture, contention, feeling, guess, hunch, hypothesis, ideas, ideology, judgement, laws, notion, opinion, philosophy, postulate, postulation, premise, presumption, presupposition, principled explanations, principles, proposition, speculation, supposition, surmise, suspicion, system of ideas, thesis, thinking, thought(s), view, and science are all synonyms for theory.
Theory synonym page has a variety of synonyms that differ in length. 2 synonyms with 4 letters and 3 synonyms with 5, 6, and 9 letters. 4 synonyms with 7, and 8 letters and 6 synonyms with 10 letters.
5 synonyms with 11 letters and 1 synonym with 13, 14, and 22 letters. For a total of 33 another word for theory.
His theory explained the phenomenon clearly.
They proposed a new scientific theory.
The theory was widely accepted initially.
She challenged the existing theory effectively.