Tercero rhymes with:
bracero, locicero, lucero, ranchero, acero, aero, aguero, alfiero, alvero, amero, barbero, barreiro, bero, bolero, borrero, botero, bracero, caballero, cafiero, calero, calogero, camaro, camero, cantero, carneiro, carnicero, carreiro, carrero, cavallero, cepero, cerro, ciminero, colmenero, companero, cordeiro, cordero, cuero, darrow, delfavero, delnero, derrow, dondero, embarcadero, eroh, escudero, faro, favero, fero, ferreiro, ferrero, ferro, financiero, garo, garrow, gero, gerow, guerrero, herrero, herro, ibero, janiero, lerro, locicero, lonero, loureiro, lucero, madero, marrero, marrow, mazzaferro, melero, mero, merow, merrow, mescalero, messeghero, minero, mistero, mogavero, monteiro, montero, mugavero, narrow, olivero, otero, palmero, passero, peguero, pharaoh, pineiro, pinero, pinheiro, quintero, ranchero, recupero, ribeiro, rivero, romero, salguero, sendero, sherrow, silguero, soltero, sombrero, sparrow, spero, taro, tinajero, valero, varo, vero, yarrow, zifferero
Tercero sounds like:
theatergoer, thrasher, thresher, tracer, tracker, tracor, traeger, trager, trageser, trauger, treachery, treasure, treasurer, treasury, trecker, tregre, trickery, trickier, trigger, troeger, trouser, trucker