light vs ray

light and ray both are nouns.

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

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

light: (physics) electromagnetic radiation that can produce a visual sensation
ray: a column of light (as from a beacon)

light (noun)	ray (noun)
any device serving as a source of illumination	cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins
a device for lighting or igniting fuel or charges or fires	any of the stiff bony spines in the fin of a fish
the visual effect of illumination on objects or scenes as created in pictures	the syllable naming the second (supertonic) note of any major scale in solmization
the quality of being luminous; emitting or reflecting light	a column of light (as from a beacon)
merriment expressed by a brightness or gleam or animation of countenance	a group of nearly parallel lines of electromagnetic radiation
mental understanding as an enlightening experience	a branch of an umbel or an umbelliform inflorescence
a particular perspective or aspect of a situation	(mathematics) a straight line extending from a point
public awareness
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

light (adjective)	ray (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

light (verb)	ray (verb)
introduce light into	expose to radiation
start or maintain a fire in	extend or spread outward from a center or focus or inward towards a center
begin to smoke	emit as rays
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

light (adverb)	ray (adverb)
with few burdens