sausage vs hotdog

sausage and hotdog both are nouns.

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

As nouns, hotdog is a hyponym of sausage; that is, hotdog is a word with a more specific, narrower meaning than sausage:

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

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