Imaginary being and Imaginativeness

Imaginary being noun - A creature of the imagination; a person that exists only in legends or myths or fiction.

Imaginativeness and imaginary being are semantically related. In some cases you can use "Imaginativeness" instead a noun phrase "Imaginary being".

Imaginativeness noun - The ability to form mental images of things that either are not physically present or have never been conceived or created by others.

Imaginary being and imaginativeness are semantically related. Sometimes you can replace phrase "Imaginary being" with "Imaginativeness", this terms are similar.