sausage vs headcheese

sausage and headcheese both are nouns.

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

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

sausage: highly seasoned minced meat stuffed in casings
headcheese: sausage or jellied loaf made of chopped parts of the head meat and sometimes feet and tongue of a calf or pig

sausage (noun)	headcheese (noun)
a small nonrigid airship used for observation or as a barrage balloon	sausage or jellied loaf made of chopped parts of the head meat and sometimes feet and tongue of a calf or pig
highly seasoned minced meat stuffed in casings