These terms are all acronyms that refer to the offense commonly known as “drunk driving.”  Different states have slightly different names for the crime.  Many states, including Kentucky, Tennessee, Illinois, Kansas, and Oklahoma use the phrase “driving under the influence” or DUI.  Iowa uses the phrase “operating while intoxicated” or OWI.  Like Nebraska and Arkansas, Missouri law uses the phrase “driving while intoxicated,” so the term DWI is most commonly used here.