ˈparəˌgram noun
Etymology: Greek ( skōmma ) para gramma (joke) by letter, from para beside, beyond, by + gramma letter — more at para- , gram
: a pun made by changing the letters of a word, especially the initial letter
• para·gram·ma·tist ˌ ̷ ̷ ̷ ̷ˈgraməd.ə̇st noun -s