1: ἀλήθω
(Strong's #229 — Verb — aletho — al-ay'-tho )

signifies "to grind at the mill," Matthew 24:41; Luke 17:35 . The Sept. has both the earlier form aleo, Isaiah 47:2 , and the later one aletho, used in the Koine period, Numbers 11:8; Judges 16:21; Ecclesiastes 12:3,4 .

2: τρίζω
(Strong's #5149 — Verb — trizo — trid'-zo )

primarily of animal sounds, "to chirp, cry," etc., is used of grinding the teeth, Mark 9:18 , RV, "grindeth" (AV, "gnasheth with"). See GNASH.

Matthew 21:44Luke 20:18Amos 9:9