Mammoth Uncensored Word List:
40 words ending with rn, 9 letters long

aboutturn alpenhorn broomcorn buckthorn clavicorn cyberporn earthborn firethorn firstborn foresworn greenhorn handsturn hartshorn heartburn krummhorn laterborn longicorn misgovern nebenkern nonmodern nonreturn overlearn oversworn premodern prereturn promodern pronghorn readjourn repattern serricorn shorthorn sloethorn stepbairn stillborn stinkhorn stockhorn subaltern sweetcorn unconcern waterworn