What Ive found is "bee" refers to spider + another gene. If there is a "bumble" in front, there is also pastel.
example:
mojavebee = mojave + spider
mojave bumblebee = majave + spider + pastel
However, the name might be different if the pastel gene combines with the third gene (besides the spider) to form a common name. ex: cinnibee going to pewterbee instead of cinny bumblebee
The other exception is when the combo already has a name, then it of course goes by that name. ex: lesserbee becoming queenbee instead of lesser bumblebee
This is just the trend Ive seen.