Here's what rhymes with semirectangular.
rectangular triangular Words that almost rhyme with semirectangular
dangler jangler tabular wrangler chancellor granular bachelor valvular paddler vascular spectacular traveller traveler glandular capsular janitor oracular scapular rattler saddler waggoner wagoner canceller dampener prattler banqueter candler caroler diameter manager parameter catheter passenger capacitor massacre vernacular caliber calibre challenger caliper fastener handsomer falconer unspectacular canvasser bannister fashioner straddler ransomer garrotter ambassador calendar grandmother examiner lavender analyser canister perivascular hexameter calender lackluster lacklustre nongranular neurovascular scavenger cardiovascular microvascular cerebrovascular