1 syllable:
bairn, cairn, nairn, nairne, tairn, theirn

2 syllables:
casern, caserne, dezern, konzern, laterne, luzern, masern, moderne, pitcairn, relearn, unlearn

3 syllables:
alatern, cbrne, matthew wearn

1 syllable:
barn, bern, berne, born, borne, bourn, bourne, burn, byrne, churn, corn, darn, earn, erne, fern, horn, kern, learn, morn, mourn, porn, quern, scorn, shorn, spurn, stern, sworn, thorn, torn, turn, urn, warn, worn, yarn, yearn

2 syllables:
adjourn, adorn, attorn, ball fern, bass horn, bead fern, beech fern, be born, careworn, car horn, chain fern, christ thorn, concern, cowbarn, cow barn, crepe fern, crow corn, deer fern, dent corn, discern, ditch fern, edirne, extern, fan fern, felt fern, field corn, film fern, firstborn, flint corn, forewarn, forlorn, french horn, glade fern, gold fern, good turn, grape fern, grass fern, green corn, hand fern, hard fern, hedge thorn, horse barn, ill turn, interne, in turn, kick turn, king fern, lace fern, lip fern, lowborn, male fern, marsh fern, o'beirne, oak fern, pine fern, post horn, rasp fern, reborn, return, rope burn, rope yarn, sauterne, scale fern, secern, seed corn, seed fern, shield fern, snake fern, soft corn, spun yarn, stem turn, stillborn, strap fern, sweet corn, sweet fern, sword fern, tea urn, timeworn, tithe barn, tongue fern, tree fern, unborn, unsworn, unworn, upturn, wall fern, war-worn, whisk fern, wood-fern, wood fern

3 syllables:
about turn, bamboo fern, basket fern, basset horn, berry fern, bird's nest fern, black tree fern, bladder fern, boston fern, boulder fern, bristle fern, brittle fern, broad beech fern, butter churn, button fern, candy corn, christmas fern, city-born, climbing fern, clover fern, coffee fern, coffee urn, creeping fern, dagger fern, day return, devil's urn, elkhorn fern, english horn, false return, fire thorn, floating fern, flour corn, foreign-born, fragile fern, giant fern, glory fern, golden fern, guinea corn, hartford fern, holly fern, in return, jersey fern, joint return, kidney fern, lady fern, leather fern, limestone fern, little horn, long beech fern, meadow fern, motor horn, mountain fern, new york fern, ostrich fern, powder horn, ribbon fern, royal fern, sago fern, scented fern, self-concern, serpent fern, silver fern, smooth lip fern, soft shield fern, soft tree fern, spider fern, spindle horn, squirrel corn, sugar corn, tax return, toothed sword fern, unconcern, walking fern, water fern, winter fern, winter urn, with concern, yankee corn

4 syllables:
annual fern, aquatic fern, banking concern, baritone horn, braun's holly fern, buckler fern, business concern, carriage return, cigarette burn, cinnamon fern, curly grass fern, earthly concern, edible corn, egyptian corn, evergreen thorn, flowering fern, fragrant cliff fern, fragrant shield fern, fragrant wood fern, hairy lip fern, indian corn, licorice fern, mosquito fern, mountain male fern, narrow beech fern, nebraska fern, northern beech fern, northern oak fern, pay as you earn, potato fern, prickly shield fern, printing concern, rattlesnake fern, sensitive fern, silver tree fern, southern beech fern, umbrella fern, without concern, wooly lip fern, worldly concern

5 syllables:
alpine lady fern, amended return, asparagus fern, automobile horn, brittle bladder fern, california fern, climbing bird's nest fern, evergreen wood fern, florida strap fern, income tax return, interrupted fern, jerusalem thorn, leathery grape fern, marginal wood fern, massachusetts fern, mountain bladder fern, mountain parsley fern, northern holly fern, oleander fern, packaging concern, point of no return, resurrection fern, skeleton fork fern, southwestern lip fern, virginia chain fern, western holly fern

6 syllables:
alabama lip fern, american wall fern, carolina pond fern, exponential return, giant scrambling fern, indian button fern, information return

7 syllables:
american parsley fern, estimated tax return, european parsley fern

8 syllables:
canary island hare's foot fern, central american strap fern, naked as the day one was born, naked as the day you were born