Vienna sausage vs hot dog

Vienna sausage and hot dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vienna sausage	Yes	No	No	No
hot dog	Yes	No	No	No

As nouns, hot dog is a hypernym of Vienna sausage; that is, hot dog is a word with a broader meaning than Vienna sausage:

Vienna sausage: short slender frankfurter usually with ends cut off
hot dog: a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll

Other hypernyms of Vienna sausage include dog, frank, frankfurter, hotdog, weenie, wiener, wienerwurst.

Vienna sausage (noun)	hot dog (noun)
short slender frankfurter usually with ends cut off	a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll
	a frankfurter served hot on a bun
	someone who performs dangerous stunts to attract attention to himself