luminance vs physical property

luminance and physical property both are nouns.

Word	Noun	Adjective	Verb	Adverb
luminance	Yes	No	No	No
physical property	Yes	No	No	No

As nouns, physical property is a hypernym of luminance; that is, physical property is a word with a broader meaning than luminance:

luminance: the quality of being luminous; emitting or reflecting light
physical property: any property used to characterize matter and energy and their interactions

luminance (noun)	physical property (noun)
the quality of being luminous; emitting or reflecting light	any property used to characterize matter and energy and their interactions