soon
One option is the word gulp.
The four-letter word for "quickly as possible" is "ASAP," which stands for "as soon as possible." It is commonly used in communication to indicate urgency or a need for expedited action.
The four letter word that means, "I forbid," is veto.veto
The four letter word is dawn.
fast
Exit
fern
wits
A four letter word meaning the foundation of something is base.
aide
Fast
step