Here's what rhymes with thermoset.
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said head fed shed fetch hedge shewed lead led read red bed dead step ahead fled sketch thread web wedge ledge med sped stead wed wretch rep sled sledge steppe ted spread bread stretch bred dread overhead pledge tread bled misled allege prep instead assayed infrared watershed widespread cent felt sent sect scent theft vent fetched vest zest best effect left went kept rest test event meant spent west affect chest helped arrest belt bent checked dealt guest lest rent slept stepped swept assent assessed lent melt nest tent ascent guessed jest knelt leaped sensed sketched wept wrecked leapt pest vexed decked deft dent fenced necked pent smelt spelt weft wrest next direct except percent accept correct perfect text breast possessed select blessed descent dressed manifest pressed stressed stretched accent cement crest elect erect invest northwest quest cleft crept dissent dwelt invent adept attest augment dreamt ferment flexed obsessed resent tempt behest bereft blest against subject extent respect attempt expect prevent suggest addressed consent reflect collect detect impressed indirect intent neglect reject suspect confessed connect exempt incorrect oppressed professed suppressed inspect lament repent southwest underwent unrest abreast clenched digest drenched intercept intersect quenched refreshed expressed protect request commenced depressed intellect architect compressed dialect distressed entrenched repressed bequest dispensed outstretched represent president contempt condensed progressed recollect perplexed discontent retrospect