xanthomonad vs eubacteria

xanthomonad and eubacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
xanthomonad	Yes	No	No	No
eubacteria	Yes	No	No	No

As nouns, eubacteria is a hypernym of xanthomonad; that is, eubacteria is a word with a broader meaning than xanthomonad:

xanthomonad: bacteria producing yellow non-water-soluble pigments; some pathogenic for plants
eubacteria: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of xanthomonad include eubacterium, true bacteria.

xanthomonad (noun)	eubacteria (noun)
bacteria producing yellow non-water-soluble pigments; some pathogenic for plants	a large group of bacteria having rigid cell walls; motile types have flagella