Can I add Antlr tokens at runtime?

I have a situation where my language contains some words that aren't known at build time but will be known at run time causing the need to constantly rebuild / redeploy the program to take into account new words. I was wandering if it was possible in Antlr generate some of the tokens from a config file?

e.g In a simplified example if I have a rule

rule : WORDS+;

WORDS : 'abc';

And my language comes across 'bcd' at runntime, I would like to be able to modify a config file to define bcd as a word rather than having to rebuild then redeploy.