I love it when the series does the calcs for you. :smugnon
1. Supersonic
Maxwell can apply the adjective "supersonic" to himself and others.
https://scribblenauts.fandom.com/wiki/Supersonic
Or at least mach 1.
2. Hypersonic Philosoraptor
Maxwell creates a Hypersonic Philosoraptor...
The Anti-Monitor turns the Known Multiverse into energy then absorbs it, before the Monitor and Anti-Monitor clashing cancels each other out and turns them both into energy, which Maxwell takes to remake the entire Multiverse.This is pretty simple all up. The multiverse is a Scribblenaut-esque...