titanosaurian vs titanosaur

titanosaurian and titanosaur both are nouns.

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

As nouns, titanosaurian and titanosaur are synonyms defined as:

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

titanosaurian (noun)	titanosaur (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