hay bacillus vs bacillus

hay bacillus and bacillus both are nouns.

Word	Noun	Adjective	Verb	Adverb
hay bacillus	Yes	No	No	No
bacillus	Yes	No	No	No

As nouns, bacillus is a hypernym of hay bacillus; that is, bacillus is a word with a broader meaning than hay bacillus:

hay bacillus: a species of bacillus found in soil and decomposing organic matter; some strains produce antibiotics
bacillus: aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil

Other hypernyms of hay bacillus include B.

hay bacillus (noun)	bacillus (noun)
a species of bacillus found in soil and decomposing organic matter; some strains produce antibiotics	aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil