banana
dresser
grammar
potato
revive
uneven
assess
Scrutinise each word carefully and don't give up so easily. And NO, it's not that they each have at least two double letters! (Please, not so easy lah~)
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ANSWER
In all of the words listed, if you take the first letter and place it at the end of the word, it will still be the same word when spelled backward.
ananab = banana
resserd = dresser
rammarg = grammar
otatop = potato
eviver = revive
nevenu = uneven
ssessa = assess
Did you figure it out? Comment away~