Theorize, Suggest
Puzzle 8 of The Moon Hard Pack
Question is: Theorize, Suggest
and the answer is: POSTULATE
Word Meaning:
POSTULATE — Something assumed without proof as being self-evident or generally accepted, especially when used as a basis for an argument. Sometimes distinguished from axioms as being relevant to a particular science or context, rather than universally true, and following from other axioms rather than being an absolute assumption.
Definitions from Wiktionary.