These can normally be verbs which are in their past simple tense. Examples include:
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Some double N words are:announceannoyannexanniversaryantennaannualbandannabannerbanningbeginningbonnetbunnycanneryconnectcannibalcanningcannoncannulacayennechannelconnoteconnoisseurcunningdinnerdisconnectevennessfanningfennelflannelfunnelfunnygrannygrinninghennainninnateinnerinningjuliennekennelmannersmanningmannishmayonnaisenannyninnynunneryopennesspanningpennantpennypinnaclepinningplanningquestionnairereconnectroadrunnerrunningrunnyscanningskinnysonnetspinningstunningsunnytanningtennistunneltyrannyuncannyunnerveunnoticedwinningwinnowzinnia
announceannualbannerbonnetbunnycanningcannoncunningdinnerfanningfunnelfunnygrinninginningmanningplanningpanningpennantrunnersonnetspinningsunnytunnelunnoticedwinning
words that start with an n.
Some words that start with N and end with N are:nationneonneuronnewbornnoonnotationnotionnounnunnylon
Words with double t's:atticattachattainattireattitudebatterybettingbrittlebarrettebuttressbetterbitterbottlebutterbuttonblottercattlecassettecommitteecluttercottoncuttingdittodiskettedinetteetiquetteflutterfritterfatterfetteredfittedglittergutterhitterhotterjitterykettleknittedknottedlittlelotterylettermattermattednettedotterpatternpattypattedpottingpotteryputterpettedrattlesettlestutterspattersputterspittingsplittingspottedswattedslottedscattertattleutterlyvettedwittedkittenlitterbatteredpatternsbetterbottompermitted