irradiant

As adjectives the difference between radiant and irradiant

is that radiant is radiating light and/or heat while irradiant is that radiates light.

As a noun radiant

is a point source from which radiation is emitted.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective irradiant is

that radiates light.

As adjectives the difference between light and irradiant

is that light is having light while irradiant is that radiates light.

As a noun light

is the natural medium emanating from the Sun and other very hot sources (now recognised as electromagnetic radiation with a wavelength of 400-750 nm), within which vision is possible.

As a verb light

is to start (a fire).

As an adverb light

is carrying little.

As a proper noun Light

is {{surname|lang=en}.

As adjectives the difference between radiate and irradiant

is that radiate is radiating from a center; having rays or parts diverging from a center; radiated while irradiant is that radiates light.

As a verb radiate

is to extend, send or spread out from a center like radii.

As a noun radiate

is (zoology) one of the radiata.