Forbid, prohibit, ban, abjure are four words that mean "to command not to do something."
The four letter word is dawn.
Bar
Exit
A four letter word meaning the foundation of something is base.
Rend is a four letter word that means to tear into pieces. Tear is also a four letter word meaning to pull apart.
The word is scam.
Ban
A six letter word to command not to do something is to forbid.
Kiss.
huge
stun