the·o·ry

– noun
1. a coherent group of general propositions used as principles of explanation for a class of phenomena.
2. a proposed explanation whose status is still conjectural, in contrast to well-established propositions that are regarded as reporting matters of actual fact.
3. a body of principles, theorems, or the like, belonging to one subject.
4. the branch of a science or art that deals with its principles or methods, as distinguished from its practice.
5. a particular conception or view of something to be done or of the method of doing it; a system of rules or principles.
6. contemplation or speculation.
7. guess or conjecture.

prac·tice

– noun
1. habitual or customary performance; operation.
2. habit; custom.
3. repeated performance or systematic exercise for the purpose of acquiring skill or proficiency.
4. condition arrived at by experience or exercise.
5. the action or process of performing or doing something
6. the exercise or pursuit of a profession or occupation, esp. law or medicine.
7. the business of a professional person.
8. the established method of conducting legal proceedings.
9. plotting; intrigue; trickery.
10. intrigues; plots.
–verb
11. to perform or do habitually or usually.
12. to follow or observe habitually or customarily.
13. to exercise or pursue as a profession, art, or occupation.
14. to perform or do repeatedly in order to acquire skill or proficiency.
15. to train or drill in something in order to give proficiency.
16. to do something habitually.
17. to exercise oneself by repeated performance in order to acquire skill.
18. to plot or conspire.