fettuccini vs alimentary paste

fettuccini and alimentary paste both are nouns.

Word	Noun	Adjective	Verb	Adverb
fettuccini	Yes	No	No	No
alimentary paste	Yes	No	No	No

As nouns, alimentary paste is a hypernym of fettuccini; that is, alimentary paste is a word with a broader meaning than fettuccini:

fettuccini: pasta in flat strips wider than linguine
alimentary paste: shaped and dried dough made from flour and water and sometimes egg

Other hypernyms of fettuccini include pasta.

fettuccini (noun)	alimentary paste (noun)
pasta in flat strips wider than linguine	shaped and dried dough made from flour and water and sometimes egg