Hostages' rhymes with:
vestiges, advantages, cottages, disadvantages, heritage's, outages, percentages, vantage's, vantages, vestiges, vintages, voltage's, wantages
Hostages' sounds like:
hajduk, hasidic, haystack, haystacks, hecht's, hectic, hegedus, heights, hesitates, hightech, hoechst's, hoists, host's, hostage, hostages, hostess, hostesses, hosts, houseguests, huestis, hyakutake