hotdog vs sausage

hotdog and sausage both are nouns.

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

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

hotdog: a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll
sausage: highly seasoned minced meat stuffed in casings

hotdog (noun)	sausage (noun)
a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll	a small nonrigid airship used for observation or as a barrage balloon
a frankfurter served hot on a bun	highly seasoned minced meat stuffed in casings
someone who performs dangerous stunts to attract attention to himself