Some words that begin and end with the same letter and contain CA are:
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Not many words begin with double letters. A few of those that do start with double letters include aardvark, eel, eerie, llama, ooh, oomph and ooze.
antennachurchdecidedecodedeludederidedefiededitededucatedeligibleemblemeraseretiquettekayaklabiallegiblemagmarecaptureregisterrecorderreassurereorderreminderreporterrequirerestoreretirerevolversecludessenseseriessermonisesheathssheepishstartstemperatetenetthirteenththirtiethtomato
To list a few: Ada. Ana. Aka.
11 letter words that begin and end with the same letter:charismaticdisappeareddiscrediteddistributedgalvanizinggerminatingseriousnesstranslucenttransparent
accessoryaddressaggressiveannuallyappallassessassassinbitternessbuccaneerblurrinessbulletproofbutterballbuttresscassettecarelessnesscarryallcoffeecommissarycommissioncrabbinessfurrinesshappinesspennilesspuffinessruddinesssluggishnessstiffnessstillnessstubbornnessstuffinesssuccesstallnessvolleyballwellnesswheelbarrow