Optical device and Planetarium

Optical device noun - A device for producing or controlling light.

Planetarium and optical device are semantically related. In some cases you can replace term "Planetarium" with "Optical device", this terms are similar.

Planetarium noun - An optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome.

Optical device and planetarium are semantically related. You can use "Optical device" instead a noun "Planetarium".

Nearby Word: planetary