escherichia vs E. coli

escherichia and E. coli both are nouns.

Word	Noun	Adjective	Verb	Adverb
escherichia	Yes	No	No	No
E. coli	Yes	No	No	No

As nouns, E. coli is a hyponym of escherichia; that is, E. coli is a word with a more specific, narrower meaning than escherichia:

escherichia: a genus of enteric bacteria
E. coli: a species of bacterium normally present in intestinal tract of humans and other animals; sometimes pathogenic; can be a threat to food safety

Other hyponyms of escherichia include Escherichia coli.

escherichia (noun)	E. coli (noun)
a genus of enteric bacteria	a species of bacterium normally present in intestinal tract of humans and other animals; sometimes pathogenic; can be a threat to food safety