pasta vs bowtie pasta

pasta and bowtie pasta both are nouns.

Word	Noun	Adjective	Verb	Adverb
pasta	Yes	No	No	No
bowtie pasta	Yes	No	No	No

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

pasta: shaped and dried dough made from flour and water and sometimes egg
bowtie pasta: pasta shaped with scalloped edges and pinched in the middle, suggestive of a bow tie

pasta (noun)	bowtie pasta (noun)
shaped and dried dough made from flour and water and sometimes egg	pasta shaped with scalloped edges and pinched in the middle, suggestive of a bow tie
a dish that contains pasta as its main ingredient