rhizoid vs leak fungus

rhizoid and leak fungus both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhizoid	Yes	No	No	No
leak fungus	Yes	No	No	No

As nouns, leak fungus is a hyponym of rhizoid; that is, leak fungus is a word with a more specific, narrower meaning than rhizoid:

rhizoid: any of various slender filaments that function as roots in mosses and ferns and fungi etc
leak fungus: fungus causing soft watery rot in fruits and vegetables and rings of dry rot around roots of sweet potatoes

Other hyponyms of rhizoid include Rhizopus stolonifer, ring rot fungus.

rhizoid (noun)	leak fungus (noun)
any of various slender filaments that function as roots in mosses and ferns and fungi etc	fungus causing soft watery rot in fruits and vegetables and rings of dry rot around roots of sweet potatoes