Hangover noun – Something that has survived from the past. Headache and hangover are semantically related. in result of heavy drinking topic. In some cases you can use "Headache" instead a noun "Hangover".
Headache noun – A dull, unpleasant, or difficult piece of work. Hangover and headache are semantically related. Sometimes you can replace term "Hangover" with "Headache", this nouns are similar. Nearby Word: headachy