Looks like somebody made txt and json versions of the Oxford Unabridged English Dictionary here: https://github.com/adambom/dictionary https://github.com/adambo

Looks like somebody made txt and json versions of the Oxford Unabridged English Dictionary here: https://github.com/adambom/dictionary https://github.com/adambom/dictionary. The json version should let build up the graph structures you're talking about pretty easily.