Here's what rhymes with fossum.
awesome possum blossom opossum Words that almost rhyme with fossum
often soften caution cation rosin herniation libation precaution microcosm tryptophan macrocosm calumniation autumn solemn forum foursome bottom column balsam dorsum sorghum bonum flotsam slalom carom boredom mortem quorum condom nostrum rostrum wampum stardom thraldom thralldom cockscomb problem quantum decorum drachm metronome gastronome sugarplum postpartum falciparum