There are multiple Hebrew words that can be translated to Tribulatiion when they appear in various Old Testament passages - צָרָה(tsarah / tsarah), צַר (tsar), אוּמְלָל אוּמְלָלָה 'umlal, 'mll', צָרָה צָרָה (tzarah / tsarah/ tsrar); all words referring to distress, trouble & persecution