2 syllables:
aaron, aerin, aeron, air in, aran, aron, arron, baren, barin, baron, baronne, barren, barron, bear in, beran, berane, berin, beron, care in, chair in, charan, charon, charren, charron, charun, cheran, claran, clarin, ehren, erin, erinn, errin, erron, err in, eyren, fair in, faren, fare in, farin, faron, farren, farron, ferran, ferren, ferrin, ferron, garin, geran, geron, glairin, guerin, hair in, haren, heren, herin, heron, herren, herrin, herron, jerren, karan, karen, karin, karon, keren, kerin, kerrin, lehren, leren, mairin, marin, marron, meran, merin, merrin, neron, nerone, nerren, pair in, paran, peren, peronne, perrin, perron, pheran, pheron, prayer in, rare in, rarin, reran, saron, scheren, schwerin, seran, seren, serin, share in, sharon, sharyn, sherin, sherine, sherrin, sherron, square in, starin', sterane, swear in, taran, taren, tear in, teran, terin, terran, terrine, terron, their in, there in, theron, varen, veren, veron, waren, wear in, weren, where in, yaren, yaron, yeren, zarin, zehren

3 syllables:
)right-paren, absperren, acheron, aderyn, affair in, alaron, ameren, aneirin, asperin, aufsperren, begehren, boucheron, bruce mclaren, camaron, cascaron, cetrarin, cithaeron, compare in, cupferron, declare in, despair in, dimeran, eberron, einsperren, erfahren, eucerin, fanfaron, fortfahren, gisteren, kate herron, laveran, lebaron, lebarron, maclaren, malaren, marc maron, mascaron, maude charron, mccarran, mccarren, mcfarren, mcferran, mcferren, mcferrin, mcferron, mclaren, mclerran, mcpheron, moneran, moneron, moucheron, mulheren, night heron, o'herron, oherron, operon, percheron, polaron, proteron, puceron, quiberon, repair in, roosteren, schwarzfahren, sierran, sticheron, stycerin, susteren, tervueren, trimeran, umkehren, vacherin, valerin, valerone, verfahren, vigneron, warfarin

4 syllables:
aberaeron, antiarin, betakeren, campbell mclaren, cinanserin, cladoceran, cyproterone, dulcamarin, ergosterin, great blue heron, great white heron, iskanderun, iskenderun, ketanserin, lactoferrin, leslie caron, linamarin, lorcaserin, luliberin, mesenteron, onocerin, overbarren, questionnaire in, rebellieren, rickshawkaran, snowy heron, sub-saharan, subsaharan, tabuaeran

5 syllables:
abfahren, clichy-la-garenne, little blue heron, mecklenburg-schwerin, nilo-saharan, pyrovalerone, tozinameran

6 syllables:
somatoliberin

11 syllables:
methylenedioxypyrovalerone

2 syllables:
warren, loren, myron, byron, purine, urine, foreign, furan, sporran, siren, boren, charen, gearan, lauren, nauran

3 syllables:
environ, honduran, andorran, aleurone, anuran, claforan, empirin, enflurane, imuran, van buren, zairean

4 syllables:
brachyuran, benzofuran, rose of sharon, agropyron, ecuadoran, genus siren, rabbit warren

5 syllables:
martin van buren, holothurian, photoblepharon