order Ictodosauria vs Ictodosauria

order Ictodosauria and Ictodosauria both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Ictodosauria	Yes	No	No	No
Ictodosauria	Yes	No	No	No

As nouns, order Ictodosauria and Ictodosauria are synonyms defined as:

order Ictodosauria and Ictodosauria: extinct reptiles of the later Triassic period

order Ictodosauria (noun)	Ictodosauria (noun)
extinct reptiles of the later Triassic period	extinct reptiles of the later Triassic period