hay bacillus vs Bacillus subtilis

hay bacillus and Bacillus subtilis both are nouns.

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

As nouns, hay bacillus and Bacillus subtilis are synonyms defined as:

hay bacillus and Bacillus subtilis: a species of bacillus found in soil and decomposing organic matter; some strains produce antibiotics

Other synonyms of hay bacillus include Bacillus globigii, grass bacillus.

hay bacillus (noun)	Bacillus subtilis (noun)
a species of bacillus found in soil and decomposing organic matter; some strains produce antibiotics	a species of bacillus found in soil and decomposing organic matter; some strains produce antibiotics