pearl-weed vs pearlwort

pearl-weed and pearlwort both are nouns.

Word	Noun	Adjective	Verb	Adverb
pearl-weed	Yes	No	No	No
pearlwort	Yes	No	No	No

As nouns, pearl-weed and pearlwort are synonyms defined as:

pearl-weed and pearlwort: any of various low-growing plants of the genus Sagina having small spherical flowers resembling pearls

Other synonyms of pearl-weed include pearlweed.

pearl-weed (noun)	pearlwort (noun)
any of various low-growing plants of the genus Sagina having small spherical flowers resembling pearls	any of various low-growing plants of the genus Sagina having small spherical flowers resembling pearls