an ‧ a ‧ gram /ˈænəɡræm/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: French ; Origin: anagramme , from Greek anagrammatismos , from ana- ( ⇨ ↑ anachronism ) + gramma 'letter' ]
a word or phrase that is made by changing the order of the letters in another word or phrase:
‘Silent’ is an anagram of ‘listen’.