Want an adaptor for a Nikon D80 to fit canon lenses

Sorry. Nikon cameras have thicker bodies than Canon cameras. Even if there was an adapter with zero thickness, the Canon lens would be too far away from the sensor or film plane of a Nikon camera to allow it to focus to infinity. This would make a Canon lens unusable for most practical purposes even if you could fit one onto a Nikon camera.

Not realistically possible, due to the incompatible lens to focal plane distances. If you found one it would either not allow infinity focussing or would need to incorporate corrective optics which add cost and ruin image quality.

All such adapters mean that the AF won't work, and focussing and image composition must be done with the aperture fully open before manually closing the aperture down to the desired value for metering and shooting. With Nikon G lenses the aperture is fully electronic, so the lens would only be operable at its smallest aperture.

You can get an adapter to allow Nikon to Canon EOS though, but as both cameras have plenty of excellent quality new and used lenses and resale values are high it's a pointless exercise.