Farewell (noun)
A wish of happiness or safety at parting, especially a permanent departure
“goodbye|adieu”
Farewell (noun)
A departure; the act of leaving
Farewell (adjective)
Parting, valedictory, final.
“a farewell discourse;”
“the band’s farewell tour”
Farewell (interjection)
Goodbye.
“He said “Farewell!” and left.”
Farewell (verb)
To bid farewell or say goodbye.
Goodbye (interjection)
; a formula used to another person or persons when the speaker, writer, or person addressed is departing.
Goodbye (noun)
An utterance of goodbye, the wishing of farewell to someone.
“John gave Rebecca a goodbye to wish her luck on her holiday.”
Goodbye (verb)
To say goodbye; to wish somebody farewell on parting.
Wiktionary