suborder Myxiniformes vs suborder Myxinoidei

suborder Myxiniformes and suborder Myxinoidei both are nouns.

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

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

suborder Myxiniformes and suborder Myxinoidei: hagfishes as distinguished from lampreys

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

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