1 syllable:
-eous, -less, -tious, brosse, brus, bruss, bus, buss, busse, cba sce, clous, croise, crous, cr ccis, cus, cuss, fluss, fress, fuhs, fuss, gres gris, gruss, gus, guss, huss, klus, krus, kus, kuss, kyuss, lsass, ltspice, muhs, musse, nuss, nusse, pholas, plisse, plus, pluss, prma hs, prus, pruss, pspice, pus, puss, pvris, qwg cis, rndis, rus, russ, russe, scgis, schluss, schuss, shas, sluss, smbus, smr mis, struss, stuss, sus, suss, swisse, thrace, thus, thuss, tm mis, trus, truss, ttp hus, tusse, us, vl-bus, vtmis, wass, whmis, wuss, xus

2 syllables:
a-plus, abrus, adjusts, baitbus, barfuss, boltbus, careplus, catbus, concuss, cost-plus, cottbus, discuss, donruss, einfluss, erdnuss, excuss, funplus, ghattas, goldfus, gyruss, homerus, hpcode-plus, huertas, incuss, kingtruss, kottbus, loveplus, mistrusts, netbus, non-pluss, nonplus, nonpluss, oneplus, opruss, pageplus, percuss, pileus, postbus, rambus, redbus, schoolbus, school bus, shortbus, succuss, untruss, vanhuss, walnuss, wrightbus

3 syllables:
adblock plus, banderas, camping bus, charlotte russe, cytisus, eurailpass, express bus, genus sus, gloomy gus, haselnuss, hasenfus, interfluous, minibus, muckenfuss, okenfuss, papenfuss, pelorus, repercuss, sasha luss, shuttle bus, subterfluous, superfluous, treasonous

4 syllables:
eleven-plus, the venture bros.

5 syllables:
simulations plus

6 syllables:
chamaecytisus

1 syllable:
butts, cuts, guts, huts, klutz, nuts, rutz, shuts, what's

2 syllables:
cirrus, doris, horus, virus, aurous, cyrus, purus, gyrus, peeress, pyrus, torus, morris, laurus, starets, morus, chorus, merits, taurus, porous, sorus, iris, cold cuts

3 syllables:
thesaurus, honduras, slow virus, effloresce, liquorice, desirous, sciurus, high spirits, arcturus, ichorous, belarus

4 syllables:
pythagoras, ardent spirits, retrovirus, brontosaurus, polyporus, myxovirus, herpes virus, stegosaurus, bearded iris, tumor virus, neutral spirits, allosaurus

5 syllables:
tyrannosaurus, apatosaurus, ichthyosaurus, japanese iris, picornavirus, british honduras, ebola virus

6 syllables:
herpes simplex virus

7 syllables:
hepatitis a virus, cytomegalovirus

8 syllables:
tobacco mosaic virus, human papilloma virus

11 syllables:
human immunodeficiency virus