St. Peter's wreath vs bridal wreath

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

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

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

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

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

St. 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