bridal-wreath vs St. Peter's wreath

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

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

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

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

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

bridal-wreath (noun)	St. Peter's 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