pies
plea, peel, pies,
Four letter words with X as the third letter:boxyfoxyluxenextpoxysexytaxitextwaxy
gain.
Skin
Some four letter words with O as the third letter are:aloeanonatomblobblotblowbookboomboonboorbootbrowbuoychopchowclodclogclotcloycookcoolcropdoomdoordropflogflopflowfoodfoolfootfrogfromglowgoodgoofgrowhoodhoofhookhoopiconidolironknobknotknowlionlookloomloonmeowmoodmoonmoormootneonnookoboeplodplotplowploypoofpoohpoolpoorprompropprowroofroomrookrootscowshodshopshotshowslopsmogsnobsoonsootspotstopthoutooktoottrodtrotuponwhoawhomwoodwoofwoolzoom
tree
baht
armybombcomecomacamedamedimedomefamefumegamehomelamelimelimbLimalimolamalimymamamemomimenamepumaRomesamesometimetame
Likely candidate word is: ache.
actsartsbathbothbytebitsbitebuttbetscotscutecatsdotsdateeatsfatefatsgatehatehatshathintojotsjetskitelatelotsletsmatsmathmitematemutenoteoathpotspetspathpitsputspatsraterotesitetoteuntovetowithzits
plan, scat, bear