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