is a specific kind of: quality.

is a broader term that covers: transparence, transparency, transparentness | semitransparency, translucence, translucency | visibility | distinctness, sharpness.

is an attribute of: clear.

is the opposite of: opacity, opaqueness.

derivation: unclouded | unclouded | clear | cloudless, unclouded | clear, open | clear | clean, clear, light, unclouded.