Yes, as long as every unit in your army has the <KHORNE> keyword, your army would be Khorne. World Eaters must always have Khorne as their mark and so would have that keyword. Technically, you could have one detachment of World Eaters, one detachment of Khorne Daemons, and one detachment of Black Legion (or any other non-cult Legion) as long as everyone in the third detachment takes Khorne as its Mark of Chaos (Abaddon has all four god marks and would qualify).
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