illumination unit vs L

illumination unit and L both are nouns.

Word	Noun	Adjective	Verb	Adverb
illumination unit	Yes	No	No	No
L	Yes	No	No	No

As nouns, L is a hyponym of illumination unit; that is, L is a word with a more specific, narrower meaning than illumination unit:

illumination unit: a measure of illumination
L: a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter

Other hyponyms of illumination unit include footcandle, lambert, lux, lx, phot.

illumination unit (noun)	L (noun)
a measure of illumination	the 12th letter of the Roman alphabet
	the cardinal number that is the product of ten and five
	a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter