A — 1: βρύχω
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(Strong's #1031 — Verb — brucho — broo'-kho )

primarily, "to bit or eat greedily" (akin to bruko, "to chew"), denotes "to grind or gnash with the teeth," Acts 7:54 .

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

primarily used of the sounds of animals, "to chirp, cry, squeak," came to signify "to grind or gnash with the teeth," Mark 9:18 .

B — 1: βρυγμός
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(Strong's #1030 — Noun Masculine — brugmos — broog-mos' )

akin to A, No. 1, denotes "gnashing" ("of teeth" being added), Matthew 8:12; 13:42,50; 22:13; 24:51; 25:30; Luke 13:28 .