As nouns the difference between wuz and cuz
is that wuz is snake, serpent while cuz is (informal) cousin.
As an adverb cuz is
(informal) because.
As a conjunction cuz is
(informal) because.
cuz
English
Etymology 1
Short for because .
Alternative forms
* cause, 'cause, cos, 'cos, coz, 'coz, 'cuz
Adverb
(-)
(informal) because
Etymology 2
Short for cousin .
Noun
(cuzzes)
(informal) cousin