Has-been and Nighthawk

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

Nighthawk and has-been are semantically related. In some cases you can use "Nighthawk" instead a noun phrase "Has-been".

Nighthawk noun - A person who is active late at night.

Has-been and nighthawk are semantically related. Sometimes you can use "Has-been" instead a noun "Nighthawk".