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, 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

4 syllables:
eleven-plus, the venture bros.

5 syllables:
simulations plus

6 syllables:
chamaecytisus

3 syllables:
deaconess, reasonless, speciousness, preciousness, heedlessness, evenness, sleeplessness, peacefulness, feebleness, ceaselessness, equetus, evilness, genus eumops, genus grus, genus meles, genus mus, genus proteles, genus quercus, genus rhus, genus vulpes, gleefulness, heedfulness, recentness, speechlessness, xenicus

4 syllables:
deceitfulness, ingeniousness, deviousness, edematous, facetiousness, libidinous, prestigiousness, unevenness

5 syllables:
agreeableness

6 syllables:
disagreeableness, heterogeneousness