phylum Acanthocephala vs acanthocephalan

phylum Acanthocephala and acanthocephalan both are nouns.

Word	Noun	Adjective	Verb	Adverb
phylum Acanthocephala	Yes	No	No	No
acanthocephalan	Yes	No	No	No

phylum Acanthocephala (noun)	acanthocephalan (noun)
phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms	any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines