Here's what rhymes with pyrethroid.

Consider these alternatives

organophosphate / phosphate pyrethroids / trapezoids insecticides / rights carbamate / late triazine / seen viroids / thyroids organochlorine / chlorine fungicides / rights cyanoacrylate / late insecticide / side allopurinol / small octyl / total geotextiles / textiles phenothiazine / seen