Friend in Japanese: 友 /to mo/
友達 /to mo da chi/
ダチ /da chi/ (informal, spoken language)
ダチ公 /da chi kou/ (very colloquial)
友人 /yuu jin/ (close friend, buddy)
親友 /shin' yuu/ (best friend, intimate friend, close friend)
益友 /e ki yuu/ (profitable friend, useful person/friend etc)
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Tomogachi means friend. You would call your friend [name]-chan if you were girls or young, and no honorifics if you were good male or adult friends.