The word you are looking for could be "gecko".
gecko
5 letter words with A in the middle:beachblandblankblastbrandchainclashclasscrankcrashdrainflankflashfrankglassgrandgrasshearthealsleavemeansmeatsnearspearlplantprankreachseatsteamstearstraintrashwearsyears
Missy
Stock
bushyeaselessaylistsmasksnoseyvisorvistatestsrosesresetnastymiserdiscobasicarsondusty
Payer
Some five letter words with L in the middle are:agletaglowailedallayalleyallotallowalloyatlasbaldybalmybalsabelaybelchbeliebellybelowbilgebulgebulkybullybylawcellociliacoliccoloncolordallydelaydelftdeltadelvedillydollyfalsefelonfilchfillyfilthfoliofollyfullygollyhalvehelixhellohillyidleriglooinlayinletisletjellyjollyjulepmelonmilkymolarmulchnylonphloxpilafpilotpolarpoliopolkapolyppulsepylonrallyrelaxrelayrelicrulersaladsalsasaltysalvesalvosilkysolarsolidsolvesulfasulkysullysylphtallytalontelextuliptulleuplitvaletvalidvalorvaluevalvewaltzwelshzilch
toque, pique
empty
There are no 5 letter words containing uu. The 6 letter word vacuum is the shortest word that contains the letters uu.
Tacky
loyalroyal