What did God appoint Ezekiel to be for the house of Israel?

Answer: A watchman

"Son of man, I have made you a watchman for the house of Israel," to hear God's word and warn the people.

““Son of man, I have made you a watchman for the house of Israel. Whenever you hear a word from My mouth, give them a warning from Me. As for you, O son of man, I have made you a watchman for the house of Israel; so hear the word from My mouth and give them the warning from Me.”— Ezekiel 3:17, 33:7 (BSB)