syringa vs Philadelphus coronarius

syringa and Philadelphus coronarius both are nouns.

Word	Noun	Adjective	Verb	Adverb
syringa	Yes	No	No	No
Philadelphus coronarius	Yes	No	No	No

As nouns, syringa and Philadelphus coronarius are synonyms defined as:

syringa and Philadelphus coronarius: large hardy shrub with showy and strongly fragrant creamy-white flowers in short terminal racemes

Other synonyms of syringa include mock orange.

syringa (noun)	Philadelphus coronarius (noun)
large hardy shrub with showy and strongly fragrant creamy-white flowers in short terminal racemes	large hardy shrub with showy and strongly fragrant creamy-white flowers in short terminal racemes