Saint Peter's wreath vs bridal wreath

Saint Peter's wreath and bridal wreath both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Peter's wreath	Yes	No	No	No
bridal wreath	Yes	No	No	No

As nouns, Saint Peter's wreath and bridal wreath are synonyms defined as:

Saint Peter's wreath and bridal wreath: shrub having copious small white flowers in spring

Other synonyms of Saint Peter's wreath include bridal-wreath, Spiraea prunifolia, St. Peter's wreath.

Saint Peter's wreath (noun)	bridal wreath (noun)
shrub having copious small white flowers in spring	shrub having copious small white flowers in spring
	Chilean evergreen shrub having delicate spikes of small white flowers