Combination of the words "turbo" and "grade" makes for a memorable domain name.
The word "TurboGrade" contains 10 letters and three syllables. Examples of popular three syllable names include KFC, Nescafé and Delicious.
Turbograde.com is a dot com domain. Dot com domains are the most prestigious top-level-domain in the world, famously used by websites like facebook.com. Once secured, a dot com all but guarantees no-one else can outrank you for your own name in the long run.