Bygone and Has-been

Bygone adjective - No longer existing.

Has-been and bygone are semantically related In some cases you can use "Has-been" instead an adjective "Bygone".

Has-been noun - One that has passed the peak of effectiveness or popularity.

Bygone and has-been are semantically related in in vogue topic. Sometimes you can use "Bygone" instead an adjective phrase "Has-been". obsolete substitute