anthology vs omnibus

anthology and omnibus both are nouns.

Word	Noun	Adjective	Verb	Adverb
anthology	Yes	No	No	No
omnibus	Yes	Yes	No	No

As nouns, omnibus is a hyponym of anthology; that is, omnibus is a word with a more specific, narrower meaning than anthology:

anthology: a collection of selected literary passages
omnibus: an anthology of articles on a related subject or an anthology of the works of a single author

Other hyponyms of anthology include divan, diwan, florilegium, garland, miscellany.

anthology (noun)	omnibus (noun)
a collection of selected literary passages	a vehicle carrying many passengers; used for public transport
	an anthology of articles on a related subject or an anthology of the works of a single author

anthology (adjective)	omnibus (adjective)
	providing for many things at once