bloom vs ray flower

bloom and ray flower both are nouns.

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

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

bloom: 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 bloom include floret, floweret, apetalous flower, inflorescence, ray floret, bud, chrysanthemum.

bloom (noun)	ray flower (noun)
a powdery deposit on a surface	small flower with a flat strap-shaped corolla usually occupying the peripheral rings of a composite flower
reproductive organ of angiosperm plants especially one having showy or colorful parts
the organic process of bearing flowers
a rosy color (especially in the cheeks) taken as a sign of good health
the best time of youth
the period of greatest prosperity or productivity

bloom (verb)	ray flower (verb)
produce or yield flowers