Tension rhymes with:
attention, contention, detention, extension, hypertension, hypotension, pretension, retention, apprehension, ascension, attention, comprehension, condescension, contention, convention, detention, dimension, dissension, extension, gentian, henschen, hypertension, hypotension, invention, laurentian, mention, misapprehension, pension, pretension, prevention, reinvention, retention, suspension
Tension sounds like:
tangeman, tangen, tangney, tanguma, tankan, tanzania, tanzanian, temkin, teng-wen, tennessean, tennison, tennyson, thinkin, thinkin', thomasina, thomasine, thomason, thomassen, thomasson, thomison, thomsen, thomson, tianjin, timken, timson, tingen, tinkham, tinsman, tomasina, tomasine, tomasini, tomasino, tomkin, tomson, tonkin, tonnesen, townsman, townson, tunisian, tunison, twonshein