Delirium tremens noun – Acute delirium caused by alcohol poisoning. Hangover and delirium tremens are semantically related In some cases you can replace term "Hangover" with "Delirium tremens", this terms are similar.
Hangover noun – Something that has survived from the past. Delirium tremens and hangover are semantically related in result of heavy drinking topic. You can use "Delirium tremens" instead a noun "Hangover".