false baby's breath vs infant's-breath

false baby's breath and infant's-breath both are nouns.

Word	Noun	Adjective	Verb	Adverb
false baby's breath	Yes	No	No	No
infant's-breath	Yes	No	No	No

As nouns, false baby's breath and infant's-breath are synonyms defined as:

false baby's breath and infant's-breath: Eurasian herb with ample panicles of small white flowers; naturalized in North America

Other synonyms of false baby's breath include Galium mollugo, white bedstraw, white madder, wild madder.

false baby's breath (noun)	infant's-breath (noun)
Eurasian herb with ample panicles of small white flowers; naturalized in North America	Eurasian herb with ample panicles of small white flowers; naturalized in North America