rigatoni vs alimentary paste

rigatoni and alimentary paste both are nouns.

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

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

rigatoni: tubular pasta in short ribbed pieces
alimentary paste: shaped and dried dough made from flour and water and sometimes egg

Other hypernyms of rigatoni include pasta.

rigatoni (noun)	alimentary paste (noun)
tubular pasta in short ribbed pieces	shaped and dried dough made from flour and water and sometimes egg