streptolysin vs erythrolysin

streptolysin and erythrolysin both are nouns.

Word	Noun	Adjective	Verb	Adverb
streptolysin	Yes	No	No	No
erythrolysin	Yes	No	No	No

As nouns, erythrolysin is a hypernym of streptolysin; that is, erythrolysin is a word with a broader meaning than streptolysin:

streptolysin: any of several hemolysins derived from strains of streptococcus
erythrolysin: any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin

Other hypernyms of streptolysin include erythrocytolysin, haemolysin, hemolysin.

streptolysin (noun)	erythrolysin (noun)
any of several hemolysins derived from strains of streptococcus	any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin