It's not 4 letters - treif
A four letter word meaning not kosher is: tref
germ
wile
It's usually "treif" but might be "tref."
antsartsABC'sactsands
Into.
A four letter word that starts with J and ends with M: jism.
kite
bend..........
Team
TourTintTiltTimeTameTankToneTuneTentTrueTrim
MeatMateMakeMindMineMintMoodMeekMaleMailMassmast