2 syllables:
be a, dia, gaea, ia, korea, leah, lia, mia, pia, rhea, ria, shia, shiah, stria, thea, tia, yttria

3 syllables:
achaea, actaea, aliyah, althaea, althea, apnoea, asea, baphia, basia, blighia, brachia, butea, circaea, crimea, cypraea, danaea, dyspnea, dyspnoea, eupnoea, garcia, gerea, hakea, hosea, idea, judea, latria, linnaea, mammea, maria, medea, napaea, nicaea, nymphaea, obeah, oriya, ostrea, pangaea, philia, pistia, plataea, psophia, richea, rufiyaa, schizaea, sofia, sophia, spiraea, tolmiea, tortilla, urea

4 syllables:
abrachia, abyssinia, acorea, antheraea, aperea, argyreia, barathea, barbarea, batrachia, bergenia, black maria, blechnaceae, brodiaea, brugmansia, caesarea, chamaea, collinsia, cornaceae, cytherea, dahabeah, diarrhea, diarrhoea, dionaea, dulcinea, eimeria, epigaea, eritrea, eschscholtzia, flindersia, fumaria, galatea, galleria, gazania, genus rhea, geoffroea, gonorrhea, gonorrhoea, hibbertia, hydnaceae, hymenaea, kampuchea, kohleria, lambertia, larvacea, leitneria, leucorrhea, leukorrhea, liguria, linaceae, linaria, logorrhea, lunaria, malpighia, mantinea, menorrhea, mertensia, naumachia, nicosia, nopalea, north korea, ochnaceae, ochrea, panacea, phthorimaea, physalia, piqueria, pizzeria, platalea, porphyria, psoralea, pyorrhea, pyorrhoea, rosacea, roystonea, sabinea, sadleria, saintpaulia, samaria, saussurea, schaffneria, seborrhea, sirenia, south korea, souvlakia, spyeria, stanhopea, steatorrhea, tanzania, testacea, thaliacea, thermobia, urginea, valkyrie

5 syllables:
albuginea, amenorrhea, amenorrhoea, amphicarpaea, antennaria, apoidea, basophilia, bougainvillaea, cassiopeia, cirripedia, cochlearia, cyclosporeae, cypripedia, decumaria, diapensia, dicranaceae, dracaenaceae, dysmenorrhea, euglenaceae, galactorrhea, hirudinea, juvenilia, kahikatea, laminaria, lysimachia, microbrachia, mysidacea, pandanaceae, pharmacopeia, pharmacopoeia, plantaginaceae, pleurobrachia, pontederia, sagittaria, solanaceae, thiourea, usnea, verbenaceae, xanthorroea

6 syllables:
ave maria, balsaminaceae, casuarinaceae, genus galleria, gorgoniacea, hydroxyurea, hypermenorrhea, malonylurea, marsupialia, nelumbonaceae, onychogalea, phenolic urea, polygonaceae, portulacacaea, preconceived idea, sulfonylurea, utricularia

7 syllables:
hippocastanaceae, mycoplasmatacaea, oligomenorrhea, republic of korea, rhizopogonaceae, valerianaceae

8 syllables:
actinomycetacaea, capital of north korea, capital of south korea, mycobacteriacaea

9 syllables:
diethylmalonylurea

4 syllables:
glyceria