A palindrome is a word or phrase that can be correctly (and identically) read in either direction - Dr. Doolittle's "Push-me-pull-you" was perhaps a palindromedary - or perhaps a camelemac...

Phrase palindromes come in two types - "perfect" palindromes, where spaces and punctuation form part of the palindrome text (as in "Able was I ere I saw Elba"), and "imperfect" palindromes, where punctuation and spaces must be ignored or adjusted when changing from one direction of reading to the other (as in "Madam I'm Adam").

Single-word palindromes are rare, and most are only three or four letters - we intend to find them all and include them in our "list of lists". 

For now, here are just a few (we are NOT going to count single-letter words such as "I", although we might include acronyms such as AEA):

bib

dad

deed

did

dud

eke

ere

ewe

exe        (a river)

eye

gag

gig

hah, heh, huh

mam,  mom,  mum

naan

nan

noon

nun

oxo

pap

pip

poop

pop

pup

radar

refer

rotor

sus

tat

tit

tot

toot

tut

wow