2 syllables:
aro, baro, barro, caro, carro, charo, charro, claro, farro, garro, haro, karow, maro, marro, morrow, naro, paro, parro, pharo, sarro, sbarro, searo, skaro, sorrow, sparo, starro, storrow, tarro, varro, yarrow, zarro, aero, aero-, arrow, barrow, bero, berro, cerro, cheiro, cheiro-, chero, clairo, clero, cuero, darrow, derro, derrow, eroh, faeroe, faro, fero, ferro, ferro-, fuero, garo, garrow, gero, gero-, gerow, guero, guerro, herro, lerro, marrow, mero, meroe, merow, merowe, merrow, narrow, pairo, pharao, pharaoh, pharoah, phero, ptero, quero, serro, shero, sherrow, sparrow, spero, sphaero, sphero, stero, taro, terro, thero, vero

3 syllables:
albaro, alfaro, alvaro, amaro, amparo, aparo, arcaro, armaro, asaro, avaro, azzaro, barbaro, bavaro, bizarro, bizzaro, blepharo, bucaro, cafaro, caparro, capraro, cassaro, catarro, cattaro, cesaro, cestaro, chaparro, chiaro, chicharro, cigarro, coccaro, coffaro, comaro, cordaro, corsaro, cuccaro, dasaro, decaro, denaro, dodaro, egaro, favaro, ferarro, ferraro, funaro, furfaro, fusaro, gasbarro, gasparro, genaro, gennaro, gibaro, guacharo, guitarro, hamtaro, hanaro, hellaro, icaro, ignaro, imaro, jibaro, jivaro, k.maro, keitaro, kentaro, kohtaro, kotaro, lautaro, lazaro, lazzaro, lesharo, litaro, lofaro, manjaro, mascaro, massaro, mataro, moonsorrow, navarro, nazzaro, notaro, pajaro, panaro, passaro, patzcuaro, pesaro, pissarro, pizarro, pizzaro, porcaro, recaro, rintaro, ryutaro, sahuaro, scalfaro, scolaro, seek-sorrow, setaro, shintaro, sodaro, spadaro, spataro, stagnaro, tafaro, tammaro, tartaro, todaro, tomaro, totaro, tsintskaro, ungaro, vaccaro, varvaro, zaccaro, zingaro, zuccaro, acero, aguero, albero, alero, alghero, alvero, amero, antero, antero-, armero, aspero, austero, aveiro, barbero, barquero, barreiro, bolero, bone marrow, borrero, botero, bracero, brasero, bucchero, cabrero, cajero, caldero, calero, camaro, camero, cantero, carneiro, carnero, carreiro, carrero, cartero, casero, cepero, cordeiro, cordero, course hero, crucero, cruzeiro, dattero, delnero, dinero, dinheiro, dondero, enero, entero, estero, esthero, exxaro, favero, febrero, ferreiro, ferrero, fichero, field sparrow, fisherrow, galero, gambero, gastero, gippsaero, granero, granjero, guerreiro, guerrero, handbarrow, hedge sparrow, herero, herrero, house sparrow, hystero, hystero-, ibero, ibero-, ictero, impero, intero, iraero, janiero, jezero, juazeiro, juicero, korero, latero, latero-, leggero, libero, ligero, llanero, lonero, lonkero, loureiro, lucero, madero, marero, marrero, maspero, melero, minero, mistero, monero, monteiro, montero, nispero, nonhero, nonzero, numero, omero, oneiro, otero, overo, pajero, palmero, pandeiro, passero, peguero, pepero, pierce-arrow, piffero, pineiro, pinero, pinheiro, polperro, pombero, portero, postero, potrero, primero, prospero, protero, protero-, puchero, puntero, quintero, ranchero, red sparrow, rezero, ribeiro, rivero, romero, ropero, rosero, ruggero, salero, salgueiro, salguero, santero, sendero, sidero, silguero, sincero, soltero, sombrero, somero, song sparrow, straight-arrow, suadero, supaero, suwarrow, swamp sparrow, tablero, tenero, tercero, torero, transaero, trasero, tree sparrow, true sparrow, tubero, uparrow, valero, vaquero, velero, vimeiro, vivero, wheelbarrow, zanjero, zotero, zucchero, zurcaroh

4 syllables:
bodo-garo, bordonaro, calderaro, campanaro, cannistraro, cannizzaro, carbonaro, catanzaro, cavagnaro, cavallaro, chanhudaro, degennaro, digennaro, famularo, manganaro, marinaro, mogavaro, molinaro, momotaro, montanaro, mortellaro, neevevaro, overmorrow, oversorrow, pagliaro, paninaro, pecoraro, pignataro, posteraro, quartararo, queretaro, shippeitaro, tig notaro, tupamaro, utamaro, yoko taro, aguacero, agujero, alfarero, alfiero, anti-hero, archivero, asadero, astillero, bandolero, brasileiro, brigadeiro, burladero, caballero, cafiero, calimero, calogero, camarero, campanero, candelero, canserbero, cape passero, carbonero, carnicero, carpintero, cavalero, cavallero, cenicero, chipping sparrow, ciminero, cimitero, cocinero, colmenero, comanchero, companero, curandero, delfavero, diablero, english sparrow, escudero, espartero, extranjero, fevereiro, forastero, franco nero, ganadero, giant taro, golden yarrow, guerrillero, habanero, heredero, hormiguero, ingeniero, jardinero, java sparrow, locicero, marinero, mazzaferro, mensajero, mescalero, messaggero, messeghero, mogavero, monastero, mugavero, nakasero, new world sparrow, novillero, olivero, panadero, paradero, paterero, patintero, pederero, peluquero, peterero, pistolero, pseudo-nero, raniero, recupero, rent-a-hero, ronan farrow, saladero, salinero, straight and narrow, straniero, taliaferro, tapadero, terutero, tinajero, tyler herro, varadero, verdadero, verdulero, vesper sparrow, zapatero, zifferero

5 syllables:
conigliaro, decristofaro, finocchiaro, jair bolsonaro, kilimanjaro, lakhan-jo-daro, mohenjo-daro, mohenjodaro, negroamaro, atascadero, azucarero, banderillero, botafumeiro, carabinero, condottiero, eddie guerrero, elicottero, embarcadero, encomendero, financiero, frigorifero, george a. romero, invernadero, lillibullero, vegetable marrow, velocifero, yoel romero

6 syllables:
chevrolet camaro, mount kilimanjaro, alfonso ribeiro, ana peleteiro, melissa fumero

7 syllables:
california romero, mitsubishi pajero

8 syllables:
italian vegetable marrow, rafael caro quintero, the rising of the shield hero

2 syllables:
farrow, bureau, gyro, zero, thorough, spiro, burro, miro, burrow, euro, biro, borrow, furrow, cairo, harrow, borough, hero, beroe, pirro

3 syllables:
sapporo, straight arrow, disk harrow, tomorrow, saguaro, broad arrow, deniro, disc harrow, janeiro, mindoro, restharrow, shapiro, sokoro

4 syllables:
autogyro, autogiro, service bureau, weather bureau, pocket borough, bow and arrow, credit bureau, rotten borough, aleph-zero, antihero, census bureau, poroporo, rabbit burrow

5 syllables:
absolute zero, chiaroscuro

6 syllables:
rio de janeiro