Hello,
I will give a crack at this for you.
Albino/albanism: Lacks black pigment. (Thats all albanism is.)
Patternless: Can be any color, but lacks any pattern.
Het: Het is the abbreviated word for heterozygous. This term is a reference for an animal that carries a less dominant or recessive trait but appears "normal". An example of this would be a normal phase leopard gecko that is het for albino. This means that although this gecko is a normal phase gecko, it carries the genes to produce albinism in its offspring.
This may help you out:
Leopard Gecko Morphs
Hope this helps!