titanosaur vs titanosaurian

titanosaur and titanosaurian both are nouns.

Word	Noun	Adjective	Verb	Adverb
titanosaur	Yes	No	No	No
titanosaurian	Yes	No	No	No

As nouns, titanosaur and titanosaurian are synonyms defined as:

titanosaur and titanosaurian: amphibious quadrupedal herbivorous dinosaur with a long thin neck and whiplike tail; of the Cretaceous mostly in the Southern Hemisphere

titanosaur (noun)	titanosaurian (noun)
amphibious quadrupedal herbivorous dinosaur with a long thin neck and whiplike tail; of the Cretaceous mostly in the Southern Hemisphere	amphibious quadrupedal herbivorous dinosaur with a long thin neck and whiplike tail; of the Cretaceous mostly in the Southern Hemisphere