give off vs ray

give off is not a noun while ray is a noun.

Word	Noun	Adjective	Verb	Adverb
give off	No	No	Yes	No
ray	Yes	No	Yes	No

As verbs, ray is a hyponym of give off; that is, ray is a word with a more specific, narrower meaning than give off:

give off: give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
ray: emit as rays

Other hyponyms of give off include effuse, reflect, shine, spark, sparkle, radiate, scintillate, fume, smoke, reek, shoot, steam.

give off (noun)	ray (noun)
	cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins
	any of the stiff bony spines in the fin of a fish
	the syllable naming the second (supertonic) note of any major scale in solmization
	a column of light (as from a beacon)
	a group of nearly parallel lines of electromagnetic radiation
	a branch of an umbel or an umbelliform inflorescence
	(mathematics) a straight line extending from a point

give off (verb)	ray (verb)
have as a by-product	expose to radiation
give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.	extend or spread outward from a center or focus or inward towards a center
	emit as rays