edmontosaurus vs hadrosaurus

edmontosaurus and hadrosaurus both are nouns.

Word	Noun	Adjective	Verb	Adverb
edmontosaurus	Yes	No	No	No
hadrosaurus	Yes	No	No	No

As nouns, hadrosaurus is a hypernym of edmontosaurus; that is, hadrosaurus is a word with a broader meaning than edmontosaurus:

edmontosaurus: duck-billed dinosaur from Canada found as a fossilized mummy with skin
hadrosaurus: any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic

Other hypernyms of edmontosaurus include duck-billed dinosaur, hadrosaur.

edmontosaurus (noun)	hadrosaurus (noun)
duck-billed dinosaur from Canada found as a fossilized mummy with skin	any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic