coronal vs flower arrangement

coronal and flower arrangement both are nouns.

Word	Noun	Adjective	Verb	Adverb
coronal	Yes	No	No	No
flower arrangement	Yes	No	No	No

As nouns, flower arrangement is a hypernym of coronal; that is, flower arrangement is a word with a broader meaning than coronal:

coronal: flower arrangement consisting of a circular band of foliage or flowers for ornamental purposes
flower arrangement: a decorative arrangement of flowers

Other hypernyms of coronal include floral arrangement.

coronal (noun)	flower arrangement (noun)
flower arrangement consisting of a circular band of foliage or flowers for ornamental purposes	a decorative arrangement of flowers