In the RigVeda many of the devas are called asuras, and many of the asuras are called devas. Sometimes they are also called both at the same time: Like "daev"ic" asuras" or "asur"ic" devas". The "-"ic"" makes those words a part of the other word. There are some beings who are both ahuric daevas "and" daevic ahuras. This shows that there was no big difference between 'ahura' and 'daeva' in the RigVeda.