lactobacillus vs true bacteria

lactobacillus and true bacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
lactobacillus	Yes	No	No	No
true bacteria	Yes	No	No	No

As nouns, true bacteria is a hypernym of lactobacillus; that is, true bacteria is a word with a broader meaning than lactobacillus:

lactobacillus: a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk)
true bacteria: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of lactobacillus include eubacteria, eubacterium.

lactobacillus (noun)	true bacteria (noun)
a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk)	a large group of bacteria having rigid cell walls; motile types have flagella