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
• premiss
• 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

Her 20-year journey (and counting) to prove her hypothesis—and the exciting new discovery of a submerged ancient port several miles off the Mediterranean shore that was likely once part of that temple—are chronicled in Cleopatra's Final Secret, a new documentary film from National Geographic. —Jennifer Ouellette, ArsTechnica, 24 Sep. 2025

One hypothesis is that the dinosaur needed stronger jaws to bite down on harder fruits or seeds, Bertozzo noted. —Julia Jacobo, ABC News, 23 Sep. 2025

In their study, the team reviewed every major hypothesis so far put forward to explain GEC formation. —New Atlas, 21 Sep. 2025

Poley told me that one of AI’s biggest strengths today is hypothesis development and expedited research. —Tony Bradley, Forbes.com, 19 Sep. 2025