Vienna sausage vs hotdog

Vienna sausage and hotdog both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vienna sausage	Yes	No	No	No
hotdog	Yes	No	No	No

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

Vienna sausage: short slender frankfurter usually with ends cut off
hotdog: 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, hot dog, weenie, wiener, wienerwurst.

Vienna sausage (noun)	hotdog (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