pearlwort vs pearlweed

pearlwort and pearlweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
pearlwort	Yes	No	No	No
pearlweed	Yes	No	No	No

As nouns, pearlwort and pearlweed are synonyms defined as:

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

Other synonyms of pearlwort include pearl-weed.

pearlwort (noun)	pearlweed (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