We found one dictionary that defines the word drillhead:

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1. drillhead: Wiktionary

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