Absent rhymes with:
adjacent, adolescent, antidepressant, bessent, complacent, complaisant, convalescent, conversant, convulsant, crescent, decent, depressant, devincent, dispersant, docent, effervescent, evanescent, fluorescent, hersant, incandescent, incessant, indecent, innocent, iridescent, luminescent, magnificent, melicent, melisent, mellicent, milissent, millisent, mustn't, nascent, obsolescent, patuxent, poussant, quiescent, recent, reminiscent, reticent, stuyvesant, suppressant, translucent, vansant, vincent, vinsant
Absent sounds like:
abscond, absconded, absentee, absentia, absinthe, aficionado, appeasement