We found one dictionary that defines the word gappist:

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1. gappist: Wiktionary

Definitions from Wiktionary (gappist) ▸ noun:  A proponent of gap creationism. ▸ Words similar to gappist ▸ Usage examples for gappist ▸ Idioms related to gappist ▸ Wikipedia articles (New!) ▸ Popular adjectives describing gappist ▸ Words that often appear near gappist ▸ Rhymes of gappist ▸ Invented words related to gappist