ταραχήtarachḗ, tar-akh-ay'; feminine from G5015; disturbance, i.e. (of water) roiling, or (of a
mob) sedition:—trouble(-ing).
Thayer's Greek Lexicon
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STRONGS G5016:
ταραχή, ταραχῆς, ἡ (παράσσω), from (Pindar), Herodotus down, disturbance, commotion: properly, τοῦὕδατος, John 5:4 (RL); metaphorically, a tumult, sedition: in plural Mark 13:8RG.