sausage vs frankfurter

sausage and frankfurter both are nouns.

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

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

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

sausage (noun)	frankfurter (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