I don't think the park would go with 'Teracoaster' as IMO, it doesn't sound as dramatic/catchy as 'Hyper/Mega/Gigacoaster.' They would just call it 'The World's Biggest Rollercoaster!'
BTW, who coined the term 'Hypercoaster?' Arrow/Magnum XL-200? Dictionary definition of 'hyper' -
http://www.dictionary.com/cgi-bin/dict.pl?term=hyper Hey, has anyone seen 'Spaceballs'? If that movie is anything to go by, a 700 footer would be called a 'Ludicrous Coaster!' :)
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The Buzzer Formerly Known As CoasterG-d