genus Psittacosaurus vs psittacosaurus

genus Psittacosaurus and psittacosaurus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Psittacosaurus	Yes	No	No	No
psittacosaurus	Yes	No	No	No

genus Psittacosaurus (noun)	psittacosaurus (noun)
most primitive genus of horned dinosaurs; early Cretaceous	primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal