bug, (failure), error, success, pass etc are the names for 
RESULT

so....
when the analysis is done on the result then we give any of 
the namings among the groups mentions(etc)
the only exception is when we dont get the result at all is 
a FALIURE!
when we get the result then comes the remaining 
terminoloigies...Iff it is as expected the result is said 
to be pass/sucesss... etc other wise
we have the result ... but its not what has been expected 
it is an error...!  AND
the reson for an such error(S) is a BUG!