I know nothing of Bloods but this is how I look at it.

Intergrade - Something that would happen naturally in the wild between species. Different subspecies of the same species that would share territory.


Cross - 2 subspecies of the same genus / species that wouldn't see each other in the wild.


Hybrid - Ball Python x Burm, Carpet x GTP, Kingsnake x Corn etc.

Not sure if this is really right but that's how I have always looked at it.