anatotitan vs hadrosaurus

anatotitan and hadrosaurus both are nouns.

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

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

anatotitan: one of the largest and most famous duck-billed dinosaurs
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 anatotitan include duck-billed dinosaur, hadrosaur.

anatotitan (noun)	hadrosaurus (noun)
one of the largest and most famous duck-billed dinosaurs	any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic