suborder Myxinoidei vs suborder Myxiniformes

suborder Myxinoidei and suborder Myxiniformes both are nouns.

Word	Noun	Adjective	Verb	Adverb
suborder Myxinoidei	Yes	No	No	No
suborder Myxiniformes	Yes	No	No	No

As nouns, suborder Myxinoidei and suborder Myxiniformes are synonyms defined as:

suborder Myxinoidei and suborder Myxiniformes: hagfishes as distinguished from lampreys

Other synonyms of suborder Myxinoidei include Hyperotreta, Myxiniformes, Myxinoidea, Myxinoidei, suborder Hyperotreta.

suborder Myxinoidei (noun)	suborder Myxiniformes (noun)
hagfishes as distinguished from lampreys	hagfishes as distinguished from lampreys