rapid vs bullet vs blitz
'bullet' = 1 min. per player ..{No move increments}.
'blitz'.. as I understand, the meaning.. = 2-to-10 min. per player .. {and-or, up to '5 seconds extra'.. added increments, per-move}.. 'Rapid' = 15 minutes, to-one hour, per player - With, up to, 25 seconds extra, per move.
.. I suppose, that one could also 'google' that {same}, question. o:

It appears there is a lot of disagreement on what exactly defines these chess time control types. Here is a stackexchange question addressing the topic:

https://support.chess.com/article/330-why-are-there-different-ratings-in-live-chess
The support link posted above wasn't available so this is from an updated article.
"Bullet rating - For games under 3 minutes.
Blitz rating - For games of 3 minutes to 10 minutes.
Rapid rating - For games 11 minutes and longer.
…
Note that the per-move bonus time is significant - not just the base minutes.
The system assumes an average game-length of 40 moves to estimate the total length of time available to each player; the result is what determines which rating is affected by a given time control:
A time control of 2 | 12 therefore results in a Blitz (not Bullet) game like so:
2 minutes + (12 seconds x 40 moves = 480 seconds) = 10 minutes"