We found one dictionary that defines the word smotherweed:

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1. smotherweed: Wiktionary

Definitions from Wiktionary (smotherweed) ▸ noun:  Any plant of the genus Bassia. ▸ Words similar to smotherweed ▸ Usage examples for smotherweed ▸ Idioms related to smotherweed ▸ Wikipedia articles (New!) ▸ Popular adjectives describing smotherweed ▸ Words that often appear near smotherweed ▸ Rhymes of smotherweed ▸ Invented words related to smotherweed