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

Argentine officials told The Associated Press on Wednesday that the leading hypothesis is that the couple may have been exposed to rodents while visiting a landfill during a bird-watching tour in the city of Ushuaia, unknowingly contracting the virus before boarding the cruise ship. —Stephen Sorace, FOXNews.com, 7 May 2026

Two Argentine officials investigating the origins of the outbreak said the government’s leading hypothesis is that a Dutch couple contracted the virus while bird-watching in Ushuaia, Argentina, before boarding. —Annie Risemberg, Los Angeles Times, 6 May 2026

Two Argentine officials investigating the origins of the outbreak said the government’s leading hypothesis is that a Dutch couple contracted the virus while bird-watching in the city of Ushuaia before boarding. —Annie Risemberg, Chicago Tribune, 6 May 2026

Two Argentine officials investigating the outbreak say the government’s leading hypothesis is that a Dutch couple contracted the virus during a bird-watching tour while visiting a garbage dump. —ABC News, 6 May 2026