hypothesis
a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Science
Organized body of knowledge about nature.
fact
a thing that is indisputably the case.
theory
a supposition or a system of ideas intended to explain something, esp. one based on general principles independent of the thing to be explained.
law
the system of rules that a particular country or community recognizes as regulating the actions of its members and may enforce by the imposition of penalties
pseudoscience
a collection of beliefs or practices mistakenly regarded as being based on scientific method.