New and learning

[mastercracker]

my wpa2 key is something like TCVNNGSXN so how could a dictionary attack work against something like that?
I know I can generate a wordlist of every combination, think it requires about 2TB of disk space, I know with aircrack/crunch if I use something like this command line:
crunch 9 9 ABCDEFGHIJKLMNOPQRSTUVWXYZ | aircrack-ng -b 00:0C:F6:55:E6:6C -w - /root/WPA-01.cap
it generates the file and tests it on the fly without using hard disk space
isn't this just bruteforcing though?
if not how can I leverage this using GPU power instead?

If your password is random then yes, there is no point in generating a dictionary for it. You are stuck with bruteforcing the keyspace. It's up to you to decide if that crack is worth the time and money investment.