nother
adjective
noth·er ˈnə-t͟hər 
variants or 'nother
: other —used especially in the phrase a whole nother —used chiefly in speech or informal prose
Example Sentences
Recent Examples on the Web This is at a whole nother level that your son isn’t even close to competing with,’ quote-unquote. 
Dave Birkett, Detroit Free Press, 23 Apr. 2018 The Sarah Connor Chronicles, pointing to a potential ‘nother rabbit hole, a site counting down 1191 days, and a world map of nuclear strike targets, along with a tally of the human and cyborg populations. Jenna Wortham, WIRED, 14 Jan. 2008
Dave Birkett, Detroit Free Press, 23 Apr. 2018 The Sarah Connor Chronicles, pointing to a potential ‘nother rabbit hole, a site counting down 1191 days, and a world map of nuclear strike targets, along with a tally of the human and cyborg populations. Jenna Wortham, WIRED, 14 Jan. 2008 Word History
Etymology
alteration (from misdivision of another) of other, adjective
First Known Use
14th century, in the meaning defined above