Decline rhymes with:
recline, cline, clyne, disincline, incline, klein, kleine, kline, recline, align, aline, cline, clyne, disincline, emlynne, hot-line, incline, klein, kleine, kline, line, lyne, lysne, malign, realign, recline, schlein
Decline sounds like:
declaim, diguglielmo, disclaim