What are the differences among a scientific fact, a hypothesis, a law, and a theory?

scientific fact - an observation that has been confirmed repeatedly
and is accepted as true (although its truth is never final)

hypothesis - a tentative theory about the natural world; a concept
that is not yet verified but that if true would explain certain facts
or phenomena; "a scientific hypothesis that survives experimental
testing becomes a scientific theory"; "he proposed a fresh theory of
alkalis that later was accepted in chemical practices"

law - a generalization that describes recurring facts or events in
nature; "the laws of thermodynamics"

theory -a well-substantiated explanation of some aspect of the natural
world; an organized system of accepted knowledge that applies in a
variety of circumstances to explain a specific set of phenomena;
"theories can incorporate facts and laws and tested hypotheses"; "true
in fact and theory"
 
The differences among a scientific fact, a hypothesis, a law, and a
theory can be very well understood from the definitions.