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, excuss, funplus, ghattas, goldfus, gyruss, homerus, hpcode-plus, huertas, incuss, kingtruss, kottbus, loveplus, mistrusts, narus, 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:
shortness, curtness, tartness, weirdness, pertness, hardness, sharpness, darkness, cold cuts

3 syllables:
inertness, expertness, alertness

4 syllables:
prince of darkness