blossom vs ray flower

blossom and ray flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
blossom	Yes	No	Yes	No
ray flower	Yes	No	No	No

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

blossom: reproductive organ of angiosperm plants especially one having showy or colorful parts
ray flower: small flower with a flat strap-shaped corolla usually occupying the peripheral rings of a composite flower

Other hyponyms of blossom include floret, floweret, apetalous flower, inflorescence, ray floret, bud, chrysanthemum.

blossom (noun)	ray flower (noun)
reproductive organ of angiosperm plants especially one having showy or colorful parts	small flower with a flat strap-shaped corolla usually occupying the peripheral rings of a composite flower
the period of greatest prosperity or productivity

blossom (verb)	ray flower (verb)
develop or come to a promising stage
produce or yield flowers