order Colymbiformes vs order Podicipediformes

order Colymbiformes and order Podicipediformes both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Colymbiformes	Yes	No	No	No
order Podicipediformes	Yes	No	No	No

As nouns, order Colymbiformes and order Podicipediformes are synonyms defined as:

Other synonyms of order Colymbiformes include Colymbiformes, order Podicipitiformes, Podicipediformes, Podicipitiformes.

order Colymbiformes (noun)	order Podicipediformes (noun)
grebes	grebes