horseleech vs leech

horseleech and leech both are nouns.

Word	Noun	Adjective	Verb	Adverb
horseleech	Yes	No	No	No
leech	Yes	No	Yes	No

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

horseleech: any of several large freshwater leeches
leech: carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end

Other hypernyms of horseleech include bloodsucker, hirudinean.

horseleech (noun)	leech (noun)
any of several large freshwater leeches	carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end
	a follower who hangs around a host (without benefit to the host) in hope of gain or advantage

horseleech (verb)	leech (verb)
	draw blood