frankfurter vs sausage

frankfurter and sausage both are nouns.

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

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

frankfurter: 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

frankfurter (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
	highly seasoned minced meat stuffed in casings