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

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

4 syllables:
alphavirus, anti-virus, antivirus, aphthovirus, arborvirus, arbovirus, astrovirus, bearded iris, bulbous iris, bunyavirus, circovirus, coltivirus, echovirus, english iris, filovirus, flavivirus, genus iris, german iris, hantavirus, herpesvirus, 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, spanish iris, stinking iris, togavirus, torovirus, ultravirus, undesirous, vernal iris, yellow iris

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

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

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

9 syllables:
nucleopolyhedrovirus

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

3 syllables:
honduras, acarus, thesaurus, liquorice, millionairess, polaris, effloresce, belarus, sciurus, high spirits, arcturus, ichorous, nereus, embarrass, acorus, ailurus, atherurus, baccharis, bos taurus, botaurus, centaurus, corchorus, greek chorus, hesperis, in chorus, leonurus, low spirits, luvarus, lyrurus, micrurus, necturus, paliurus, petaurus, pipturus, pylorus, quakeress, seiurus, silurus, tapirus, triturus

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

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

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

7 syllables:
genus tyrannosaurus, pachycephalosaurus