Figment and Phantasma

Figment noun - A conception or image created by the imagination and having no objective reality.

Phantasma and figment are semantically related in real topic. In some cases you can use "Phantasma" instead a noun "Figment".

Phantasma noun - Something existing in perception only.

Figment and phantasma are semantically related in dream topic. Sometimes you can use "Figment" instead a noun "Phantasma", if it concerns topics such as real.