Honestly some people would say there isn't one, or that xenophobia doesn't exist and it's all racism. We've learned from history that when some fascist needs an 'other' to rally the nation against, they start by explicitly sowing fear to exacerbate latent, unfocused fear of uncertainty into blatant, focused racism, in the name of 'the nation'.

Xenophobia is the hatred of all foreigners, whereas racism is more targeted. If I'm OK with most foreigners but hate the French, that's racism. But if I hate all foreigners then I'm xenophobic. (I'm neither btw.)