luminosity is synonymous to brightness
Burning, brightness, radiance, blush, bloom, passion, warmth, incandescence, gusto...
It depends on what the sentence is: The brightness of the sun is blinding. The word brightness would be an adjective.
"High-quality and luxury are often synonymous in the minds of consumers looking for premium products."
The word bright has one syllable. It is pronounced BRYT.
Decrease
Syonymous is the adjectival form of synonym.
You've spelled the word "synonymous" correctly :)
Posterior?
extend
the brightness control is the control that varies the luminance of the fluorescent screen of a cathode-ray tube, for a given input signal, by changing the grid bias of the tube and hence the beam current.The iris diaphram contains the amount of light that can enter through to the specimen.
Necessary, important
avarice