Corynebacterium diphtheriae vs C. diphtheriae

Corynebacterium diphtheriae and C. diphtheriae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Corynebacterium diphtheriae	Yes	No	No	No
C. diphtheriae	Yes	No	No	No

As nouns, Corynebacterium diphtheriae and C. diphtheriae are synonyms defined as:

Corynebacterium diphtheriae and C. diphtheriae: a species of bacterium that causes diphtheria

Other synonyms of Corynebacterium diphtheriae include Klebs-Loeffler bacillus.

Corynebacterium diphtheriae (noun)	C. diphtheriae (noun)
a species of bacterium that causes diphtheria	a species of bacterium that causes diphtheria