Synonyms of hypothesis

hypothesis

noun

hī-ˈpä-thə-səs 

as in theory

an idea that is the starting point for making a case or conducting an investigation

working on the hypothesis that teenagers function better in the late morning, some high schools are starting classes later

Synonyms & Similar Words

• theory
• thesis
• proposition
• premise
• assumption
• suggestion
• guess
• supposition
• impression
• proposal
• inference
• theorem
• hunch
• conjecture
• suspicion
• speculation
• presumption
• notion
• generalization
• concept
• presupposition
• surmise
• concession
• construct
• conception
• guesswork
• abstraction
• feeling
• proffer
• inkling

Antonyms & Near Antonyms

• fact
• knowledge
• assurance
• certainty

Synonym Chooser

How does the noun hypothesis differ from other similar words?

The words law and theory are common synonyms of hypothesis. While all three words mean "a formula derived by inference from scientific data that explains a principle operating in nature," hypothesis implies insufficient evidence to provide more than a tentative explanation.

a hypothesis explaining the extinction of the dinosaurs

When can law be used instead of hypothesis?

The synonyms law and hypothesis are sometimes interchangeable, but law implies a statement of order and relation in nature that has been found to be invariable under the same conditions.

the law of gravitation

In what contexts can theory take the place of hypothesis?

The words theory and hypothesis can be used in similar contexts, but theory implies a greater range of evidence and greater likelihood of truth.

the theory of evolution

Example Sentences

Recent Examples of hypothesis

Something else that supports the hypothesis that recent meteors have been larger than usual is the prevalence of sonic booms — loud, explosive sounds caused by shockwaves when meteoroids, small rocky or metallic bodies from space, penetrate deeper into the Earth's atmosphere than usual. —Jamie Carter, Space.com, 27 Mar. 2026

This hypothesis was presented to me. —Mikey O'Connell, HollywoodReporter, 27 Mar. 2026

As the papers’ authors admit, the abundance of the intriguing isotope could far more easily be explained by natural processes spanning billions of years, casting doubt on the spicy hypothesis that 3I/ATLAS could be an alien spacecraft using a fusion reactor to propel itself. —Victor Tangermann, Futurism, 25 Mar. 2026

The hypothesis, though, made sense. —Eric Boodman, STAT, 23 Mar. 2026