join, meet
A word meaning "to come together" is join.
link
The word "conjoins" - meaning "connects two things together".
A four letter word meaning not kosher is: tref
kill
into
aver
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.
Writ
Faux.