supposition
Theoretically
hypothetically
Holistic theory
Arya
theory
Hypothesis may be the word you are looking for.
The opposite of theory is typically practice. While theory refers to a set of principles or ideas used to explain something, practice involves the actual application or implementation of those principles.
its another word for " because " ^_^
on paper
quote
The word hypothesis is another word for an educated guess.Similar terms include theory and speculation.
A "theory" is a scenario of what might be.