myrtle family vs Myrtaceae

myrtle family and Myrtaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
myrtle family	Yes	No	No	No
Myrtaceae	Yes	No	No	No

As nouns, myrtle family and Myrtaceae are synonyms defined as:

Other synonyms of myrtle family include family Myrtaceae.

myrtle family (noun)	Myrtaceae (noun)
trees and shrubs yielding a fragrant oil	trees and shrubs yielding a fragrant oil