Difference between Au Revoir and Bye

AU REVOIR vs BYE: NOUN

Obsolete spelling of bee.
You advance to the next round in a tournament without playing an opponent
A farewell remark
A secondary matter; a side issue.
The position of one who draws no opponent for a round in a tournament and so advances to the next round.
An extra scored when the batsmen take runs after the ball has passed the striker without hitting either the bat or the batsman.
The position of a person or team in a tournament or competition who draws no opponent in a particular round so advances to the next round unopposed, or is awarded points for a win in a league table; also the phantom opponent of such a person or team.
In certain games, a station or place of an individual player.
A thing not directly aimed at; something which is a secondary object of regard; an object by the way, etc.; as in on or upon the bye, i. e., in passing; indirectly; by implication.
A run made upon a missed ball.
In various sports in which the contestants are drawn in pairs, the position or turn of one left with no opponent in consequence of an odd number being engaged.
The hole or holes of a stipulated course remaining unplayed at the end of a match.
In passing; by way of digression; apropos to the matter in hand.
A dwelling.

Farewell, Bye bye, Good by, Good bye, Good day, So long, Bye, Goodby, Sayonara, Cheerio, Auf wiedersehen, Adieu, Adios, Goodbye, Arrivederci

Good bye, Side, Incident, Pass, So long, Good day, Sayonara, Arrivederci, Goodby, Cheerio, Auf wiedersehen, Au revoir, Adieu, Adios, Goodbye

Hurray, Hooray, Monsieur, Merci, Hello, Goodnight, Bon voyage, Farewell, Bye, Goodby, Sayonara, Adieu, Adios, Goodbye, Arrivederci

Greeting, Hello, Farewell, Goodnight, Incidental, Side, Incident, Pass, Sayonara, Arrivederci, Goodby, Au revoir, Adieu, Adios, Goodbye

If he threatens, tell him ok bye bye.
Bye bye, buy bonds, and lots of them!
BYE BYE, BRA; w Rudy Simons, m Morton Zieve.
Just once, before I say; Hasta la bye bye!
When We Meet In The Sweet Bye And Bye.
Till we meet in the sweet bye and bye.
Bye Santa and Bye Reindeer and Bye elves and Bye Mrs.
After using QOD City Bye Bye Frizz Shampoo, apply QOD City Bye Bye Frizz Conditioner on the ends of damp hair and massage it.
Eventually, Grundoon learns to say two things: "Bye" and "Bye bye.".
Bye Keeho bye Theo bye Jiung bye Intak bye Soul bye Jongseob have a wonderful day stay safe and peace out.