bloodsucker vs segmented worm

bloodsucker and segmented worm both are nouns.

Word	Noun	Adjective	Verb	Adverb
bloodsucker	Yes	No	No	No
segmented worm	Yes	No	No	No

As nouns, segmented worm is a hypernym of bloodsucker; that is, segmented worm is a word with a broader meaning than bloodsucker:

bloodsucker: carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end
segmented worm: worms with cylindrical bodies segmented both internally and externally

Other hypernyms of bloodsucker include annelid, annelid worm.

bloodsucker (noun)	segmented worm (noun)
carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end	worms with cylindrical bodies segmented both internally and externally