We found one dictionary that defines the word smoothhead:

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1. smoothhead: Wiktionary

Definitions from Wiktionary (smoothhead) ▸ noun:  Any fish with a smooth head. ▸ Words similar to smoothhead ▸ Usage examples for smoothhead ▸ Idioms related to smoothhead ▸ Wikipedia articles (New!) ▸ Popular adjectives describing smoothhead ▸ Words that often appear near smoothhead ▸ Rhymes of smoothhead ▸ Invented words related to smoothhead