hypothesis (n.)

• affirmation
• assertion
• assumption
• axiom
• basis
• conjecture
• data
• foundation
• ground
• guesswork
• inference
• lemma
• position
• postulate
• postulation
• premise
• premiss
• presumption
• presupposition
• proposition
• speculation
• statement
• sumption
• supposal
• supposition
• surmise
• theorem
• theory
• thesis