medicinal leech vs hirudinean

medicinal leech and hirudinean both are nouns.

Word	Noun	Adjective	Verb	Adverb
medicinal leech	Yes	No	No	No
hirudinean	Yes	No	No	No

As nouns, hirudinean is a hypernym of medicinal leech; that is, hirudinean is a word with a broader meaning than medicinal leech:

medicinal leech: large European freshwater leech formerly used for bloodletting
hirudinean: carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end

Other hypernyms of medicinal leech include bloodsucker, leech.

medicinal leech (noun)	hirudinean (noun)
large European freshwater leech formerly used for bloodletting	carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end