bay wreath vs lei

bay wreath and lei both are nouns.

Word	Noun	Adjective	Verb	Adverb
bay wreath	Yes	No	No	No
lei	Yes	No	No	No

As nouns, lei is a hypernym of bay wreath; that is, lei is a word with a broader meaning than bay wreath:

bay wreath: (antiquity) a wreath of laurel foliage worn on the head as an emblem of victory
lei: flower arrangement consisting of a circular band of foliage or flowers for ornamental purposes

Other hypernyms of bay wreath include chaplet, coronal, garland, wreath.

bay wreath (noun)	lei (noun)
(antiquity) a wreath of laurel foliage worn on the head as an emblem of victory	flower arrangement consisting of a circular band of foliage or flowers for ornamental purposes