expression vs light

expression and light both are nouns.

Word	Noun	Adjective	Verb	Adverb
expression	Yes	No	No	No
light	Yes	Yes	Yes	Yes

As nouns, light is a hyponym of expression; that is, light is a word with a more specific, narrower meaning than expression:

expression: the feelings expressed on a person's face
light: merriment expressed by a brightness or gleam or animation of countenance

Other hyponyms of expression include leer, spark, sparkle, twinkle, gloominess.

expression (noun)	light (noun)
the act of forcing something out by squeezing or pressing	any device serving as a source of illumination
the feelings expressed on a person's face	a device for lighting or igniting fuel or charges or fires
a word or phrase that particular people use in particular situations	the visual effect of illumination on objects or scenes as created in pictures
the style of expressing yourself	the quality of being luminous; emitting or reflecting light
expression without words	merriment expressed by a brightness or gleam or animation of countenance
a group of symbols that make a mathematical statement	mental understanding as an enlightening experience
the communication (in speech or writing) of your beliefs or opinions	a particular perspective or aspect of a situation
a group of words that form a constituent of a sentence and are considered as a single unit	public awareness
(genetics) the process of expressing a gene	a visual warning signal
	an illuminated area
	a person regarded very fondly
	(physics) electromagnetic radiation that can produce a visual sensation
	having abundant light or illumination
	a condition of spiritual awareness; divine illumination

expression (adjective)	light (adjective)
	of comparatively little physical weight or density
	psychologically light; especially free from sadness or troubles
	not great in degree or quantity or number
	of the military or industry; using (or being) relatively small or light arms or equipment
	(used of color) having a relatively small amount of coloring agent
	characterized by or emitting light
	(physics, chemistry) not having atomic weight greater than average
	of little intensity or power or force
	easily assimilated in the alimentary canal; not rich or heavily seasoned
	silly or trivial
	weak and likely to lose consciousness
	having little importance
	less than the correct or legal or full amount often deliberately so
	designed for ease of movement or to carry little weight
	moving easily and quickly; nimble
	(used of soil) loose and large-grained in consistency
	having relatively few calories
	(of sound or color) free from anything that dulls or dims
	(of sleep) easily disturbed
	marked by temperance in indulgence
	very thin and insubstantial
	casual and unrestrained in sexual behavior
	demanding little effort; not burdensome
	(used of vowels or syllables) pronounced with little or no stress
	intended primarily as entertainment; not serious or profound

expression (verb)	light (verb)
	introduce light into
	start or maintain a fire in
	begin to smoke
	to come to rest, settle
	alight from (a horse)
	fall to somebody by assignment or lot; passed
	cause to start burning; subject to fire or great heat

expression (adverb)	light (adverb)
	with few burdens