orzo vs pasta

orzo and pasta both are nouns.

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

As nouns, pasta is a hypernym of orzo; that is, pasta is a word with a broader meaning than orzo:

orzo: pasta shaped like pearls of barley; frequently prepared with lamb in Greek cuisine
pasta: shaped and dried dough made from flour and water and sometimes egg

Other hypernyms of orzo include alimentary paste.

orzo (noun)	pasta (noun)
pasta shaped like pearls of barley; frequently prepared with lamb in Greek cuisine	shaped and dried dough made from flour and water and sometimes egg
	a dish that contains pasta as its main ingredient