Hypothisys Theory are those which are assumption's or those which are not proved or hard to prove
for example: Universe is expanding is very second is a hypothesis since there is no good technology now in earth to measure it! and also Definetly it is not small it can be said so. /But "Moon is a satellite of earth" is FACT it needs no experiment to prove.
Law's are those which governs every activity of & in earth.
For example Newton's laws of gravity govern the gravitation motion earth it says every object felt in the atmosphere will tend to reach the ground a soon as possible even thought it is fact that a object left will fall down. IT DOES NOT SPEAK ABOUT PARTICULAR MATERIAL HENCE IT IS LAW