chlamydia vs eubacterium

chlamydia and eubacterium both are nouns.

Word	Noun	Adjective	Verb	Adverb
chlamydia	Yes	No	No	No
eubacterium	Yes	No	No	No

As nouns, eubacterium is a hypernym of chlamydia; that is, eubacterium is a word with a broader meaning than chlamydia:

chlamydia: coccoid rickettsia infesting birds and mammals; cause infections of eyes and lungs and genitourinary tract
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of chlamydia include eubacteria, true bacteria.

chlamydia (noun)	eubacterium (noun)
coccoid rickettsia infesting birds and mammals; cause infections of eyes and lungs and genitourinary tract	a large group of bacteria having rigid cell walls; motile types have flagella
a sexually transmitted infection caused by bacteria of the genus Chlamydia