nods
hush
Wrap
A four letter word meaning not kosher is: tref
The 'missing word' is wrap.
The letter U in the word four is actually silent. The word is pronounced identically to the word "for".
kill
aver
into
The word pine can have that meaning.
A four-letter word for cooking fat is "lard".
A four letter word meaning to grow light as the sun rises is dawn.
A four letter word meaning the foundation of something is base.