In Amos 8:11, God says He will send a famine of what?

Answer: Hearing the LORD's words

God warned of a famine not of bread or water, but of hearing the words of the LORD.

“Behold, the days are coming, declares the Lord GOD, when I will send a famine on the land—not a famine of bread or a thirst for water, but a famine of hearing the words of the LORD.”— Amos 8:11 (BSB)