We found one dictionary that defines the word bombweed:

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1. bombweed: Wiktionary

Definitions from Wiktionary (bombweed) ▸ noun:  Synonym of fireweed ▸ Words similar to bombweed ▸ Usage examples for bombweed ▸ Idioms related to bombweed ▸ Wikipedia articles (New!) ▸ Popular adjectives describing bombweed ▸ Words that often appear near bombweed ▸ Rhymes of bombweed ▸ Invented words related to bombweed