Letters that make bye-bye
b, e, y are letters that make 'bye-bye'
1 possible definitions for 'bye-bye'
Under this definition, bye-bye is a noun and has the following properties:
good-bye, adios, arrivederci, auf wiedersehen, au revoir, bye, cheerio, good-by, goodby, goodbye, good day, sayonara, so long, adieu have the same meaning as 'bye-bye'
'bye-bye' can be a type of farewell, word of farewell.