This category covers establishments primarily engaged in manufacturing dry macaroni, spaghetti, vermicelli, and noodles

Vermicelli is just a thinner pasta than spaghetti.

Spaghettini, or tini spaghetti can be substituted for vermicelli.

No, but you can put spaghetti sauce on top of any sort of noodle or pasta! Spaghetti is a certain type of long, thin noodle that is different from the flat egg noodles.

Italy is known for a variety of pasta including fecttachini, rigatoni, spaghetti, penne, macaroni, fedelini, bucatini, vermicelli, bavette, and lasagna.