hadrosaur vs anatotitan

hadrosaur and anatotitan both are nouns.

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

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

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

Other hyponyms of hadrosaur include corythosaur, corythosaurus, edmontosaurus, trachodon, trachodont.

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