Clean. In Hebrew transliteration, "tahowr" meaning clean, fair, pure.
Unclean. In Hebrew transliteration, "tame" meaning contaminated, foul, defiled.
Un-Kosher. Yahweh wanted to make a difference between His people, Israel and the pagan nations around them who gathered the harvest in their temples and them offered a kid boiled in its mother's milk to their pagan gods. He wanted them not to learn the way of the heathen (Jeremiah 10:2) and adopt it in there time of bringing in the tithes of the harvest.
How is it you do not understand that I did not speak to you concerning bread?--but to beware of the[e]leaven of the Pharisees and Sadducees.”Then they understood that He did not tell them to beware of the leaven of bread, but of the [f]doctrine of the Pharisees and Sadducees.