Here are hundreds of seven letter words with the n letter in the third and sixth position of the words. Bandana and also the spelling of bandanna (8 letters)

Amnions, banding, banging, banking, banning, banyans, bending, benzene, benzine, binding, binging, binning, bonbons, bonding, bonging, bonking, bunging, bunions, bunking, bunting, cancans, canning, cannons, canting, cantons, canyons, condone, confine, conking, conning, consent, contend, content, convene, convent, cunning, dancing, danging, denting, denying, dinging, dinning, donging, donning, dunging, dunking, dunning, fanning, fanzine, fencing, fending, fenland, finding, fondant, funding, funking, ganging, genning, genuine, ginning, ginseng, gonging, gunning, handing, hanging, hinging hinting, honking, hunting, jinking, jinxing, junking, kenning, kinking, lancing, landing, lending, lenient, lensing, lindens, linking, longing, lunging, manhunt, mankind, manning, mending, mincing, minding, minions, minting, minuend, mundane, oinking, panging, panning, panting, pendant, pendent, pending, pennant, penning, pennons, pinging, pinions, pinking, pinning, poncing, ponging, ponying, pungent, punning, punting, randing, ranging, ranking, ranting, renowns, renting, rinding, ringing, rinking, rinsing, running, sanding, sending, sensing, singing, sinking, sinning, sunning, suntans, syncing, tangent, tanking, tanning, tannins, tending, tendons, tenpins, tensing, tenting, tinging, tinning, tinting, tonging, vanning, venting, wanking, wanting, wantons, wending, wincing, winding, winging, winking, winning, yanking