πόνοςpónos, pon'-os; from the base of G3993; toil, i.e. (by implication) anguish:—pain.
Thayer's Greek Lexicon
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STRONGS G4192:
πόνος, πόνου, ὁ (πένομαι (see πένης)), from Homer down, the Sept. for עָמָל, יְגִיעַ, etc., labor, toil; 1. equivalent to great trouble, intense desire: ὑπέρτίνος (genitive of person), Colossians 4:13 (where Rec. has ζῆλον (cf. Lightfoot at the passage)). 2.pain: Revelation 16:10; Revelation 21:4. (Synonym: see κόπος, at the end.)