Portends rhymes with:
attends, contends, extends, intends, overextends, pretends, tends, amends, arends, ascends, attends, backends, befriends, bends, blends, commends, comprehends, contends, defends, depends, descends, ends, extends, fends, friend's, friends, friends', intends, lends, offends, overextends, pretends, recommends, sends, spends, suspends, tends, transcends, trends, wends
Portends sounds like:
portentous, portents, predominates, pretends, pretentious