order Colymbiformes vs order Podicipitiformes

order Colymbiformes and order Podicipitiformes both are nouns.

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

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

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

order Colymbiformes (noun)	order Podicipitiformes (noun)
grebes	grebes