Some four letter words ending in N are:
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Alan, bean, corn, darn, earn, flan, glen, horn, iron, join, koan, loan, moan, oven, plan, roan, span, then, upon, vain, warn, yarn, Zion
Nick Nook Neck
6 letter words starting and ending with N:napkinnationneuronnotion
Some seven letter words ending in N are:BritainbullioncautioncurtaindrunkendungeonemotionenvironerosionfashionfissiongelatinLincolnkitchenmansionmentionmillionmissionovationpassionpelicanportionpuritanvenisonversion
Motion is all I can think of
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