The term 'reduce tension' can be achieved by using the crossword solutions LETUP, RELAX, and UNLAX. All three words have five letters and are related to calming down and relieving stress. LETUP means to become less intense or to decrease in intensity. RELAX means to make or become less tense or anxious. UNLAX means to become less tense or to become more relaxed. Therefore, all three words can be used to reduce tension.