Synonyms for Catchweed:

n.

catchweed (noun)
Galium Aparine, clivers, spring cleavers, goose grass, cleavers.
plant (noun)
Galium Aparine, clivers, spring cleavers, goose grass, cleavers.

Other synonyms:

Galium aparine
Galium Aparine.
Other relevant words:
cleavers.