2 syllables:
cyrus, dyrus, gyrus, hiris, iris, irous, jairus, pyrus, siris, tiris, tyrus, virus, xyris

3 syllables:
bucyrus, delthyris, desirous, dutch iris, dwarf iris, inspire us, lathyrus, osiris, papyrus, plant virus, poxvirus, provirus, psithyrus, slow virus, subvirus

4 syllables:
alphavirus, anti-virus, antivirus, aphthovirus, arborvirus, arbovirus, astrovirus, bearded iris, bulbous iris, bunyavirus, circovirus, coltivirus, echovirus, english iris, flavivirus, genus iris, german iris, hantavirus, herpesvirus, herpes virus, inovirus, kuttervirus, lentivirus, lyssavirus, megavirus, mimivirus, mycovirus, myxovirus, nairovirus, norovirus, oncovirus, parvovirus, persian iris, pestivirus, phlebovirus, pithovirus, pneumovirus, potyvirus, ranavirus, reovirus, retrovirus, rhabdovirus, rhinovirus, ribovirus, rotavirus, rubivirus, sapovirus, sequivirus, simplexvirus, smallpox virus, spanish iris, stinking iris, togavirus, torovirus, tumor virus, ultravirus, undesirous, vernal iris, yellow iris, zika virus

5 syllables:
adenovirus, alfamovirus, animal virus, archaeothyris, arenavirus, arterivirus, baculovirus, billy ray cyrus, calicivirus, coronavirus, coxsackievirus, dalmatian iris, dependovirus, ebolavirus, ebola virus, enterovirus, erythrovirus, florentine iris, granulovirus, henipavirus, hepadnavirus, hepatovirus, japanese iris, luteovirus, morbillivirus, oncornavirus, orthopoxvirus, pandoravirus, papovavirus, picornavirus, poliovirus, rhadinovirus, sarbecovirus, suipoxvirus, tobamovirus, wound tumor virus

6 syllables:
aquabirnavirus, avast antivirus, herpes simplex virus, herpes zoster virus, influenzavirus, leporipoxvirus, lymphocryptovirus, mastadenovirus, metapneumovirus, orthohantavirus, orthomyxovirus, orthopneumovirus, papillomavirus, paramyxovirus, polyomavirus, varicellovirus, vesiculovirus

7 syllables:
alphacoronavirus, aviadenovirus, betacoronavirus, cytomegalovirus, deltacoronavirus, dionysus-osiris, gammacoronavirus, hepatitis a virus, orthohepadnavirus

8 syllables:
human papilloma virus, tobacco mosaic virus

9 syllables:
nucleopolyhedrovirus

11 syllables:
human immunodeficiency virus

2 syllables:
aurous, carrots, ceras, chorus, cirrus, cuirass, doris, ferrous, heiress, horus, larus, laurus, merits, morris, morus, parus, pirates, porous, purace, purus, pyrrhus, sorus, starets, taurus, terrace, torus

3 syllables:
prosperous, nonporous, conference, phosphorous, ponderous, bosporus, sonorous, tolerance, phosphorus, dolorous, aberrance, acorus, ailurus, arcturus, atherurus, baccharis, belarus, bos taurus, botaurus, centaurus, corchorus, embarrass, greek chorus, hesperis, high spirits, honduras, in chorus, leonurus, low spirits, luvarus, lyrurus, micrurus, necturus, paliurus, petaurus, pipturus, polaris, pylorus, quakeress, sciurus, seiurus, silurus, tapirus, thesaurus, triturus

4 syllables:
press conference, preposterous, news conference, intolerance, malodorous, rhinoceros, allosaurus, ameiurus, ankylosaurus, ardent spirits, automeris, barosaurus, brontosaurus, byelarus, callisaurus, camptosorus, cistothorus, conilurus, cyclosorus, dasyurus, dinoceras, dipsosaurus, disembarrass, hadrosaurus, hydrocharis, hydrochoerus, in good spirits, in high spirits, in low spirits, menticirrhus, neutral spirits, nigroporus, ocyurus, ophisaurus, palinurus, phylloporus, plesiosaurus, pleurosorus, polyborus, polycirrus, polyporus, raphicerus, sceloporus, seismosaurus, stegosaurus, sternotherus, tetrapturus, thryothorus, urosaurus, xenosaurus

5 syllables:
actinomeris, alepisaurus, alopecurus, apatosaurus, british honduras, ceratosaurus, chlamydosaurus, corythosaurus, deinocheirus, edaphosaurus, edmontosaurus, eleocharis, herrerasaurus, ichthyosaurus, megalosaurus, oligoporus, paradoxurus, pisanosaurus, psittacosaurus, staurikosaurus, styracosaurus, titanosaurus, tyrannosaurus

6 syllables:
genus brontosaurus, genus stegosaurus, judgement on the merits, judgment on the merits, tamiasciurus

7 syllables:
genus tyrannosaurus, pachycephalosaurus