As nouns the difference between azz and razz
is that azz is ass; backside while razz is (poker) a version of seven card stud where the worst poker hand wins (called lowball).
As a verb razz is
(informal) tease playfully; heckle.
azz
English
Noun
(es)
ass; backside
References
* Google Books: [https://www.google.co.uk/search?tbs=bks%3A1&tbo=1&q=%22dat+azz%22&btnG=Search+Books&gws_rd=ssl]
razz
English
Noun
(-)
(poker) A version of seven card stud where the worst poker hand wins (called lowball).
Verb
(es)
(informal) Tease playfully; heckle.
(informal) Heckle by blowing a raspberry.
(informal) (Newfoundland) To drive an automobile around
See also
* on the razz