Here's what rhymes with siphonous.
bonus slowness lowness coronas cacophonous Words that almost rhyme with siphonous
donas aromas comas sarcomas kimonos dichotomous lymphomas gliomas diplomas hematomas carcinomas granulomas focus foetus hotness notice hopeless locus homeless cirrhosis ferocious hostess lotus psychosis bogus bolus modus polis doughnuts loess poetess ptosis soulless boneless donuts toneless bolas colas togas goalless poets fibrosis boldness coldness cyanosis meiosis mitosis nobleness poultice proneness crocus grownups refocus smokeless kopeks holdups roebucks cloacas drollness opponents sclerosis acidosis atrocious hypnosis neurosis rodents locusts remoteness embolus cupolas weaponless blowups docents foments snowbanks sobriquets cosmoses violists diagnosis moments necrosis thrombosis exponents apotheosis precocious scoliosis symbiosis quotients deponents halitosis pianolas components prognosis proponents apoptosis phagocytosis condolence leukocytosis sarcoidosis psychoneurosis gladiolus elopements enthronements arteriosus enrollments amyloidosis aponeurosis hydronephrosis enrolments misdiagnosis postponements chiropodists cosmogonists honeylocusts encroachments erythematosus metempsychosis mononucleosis arteriosclerosis