chrestomathy vs selection

chrestomathy and selection both are nouns.

Word	Noun	Adjective	Verb	Adverb
chrestomathy	Yes	No	No	No
selection	Yes	No	No	No

As nouns, selection is a hypernym of chrestomathy; that is, selection is a word with a broader meaning than chrestomathy:

chrestomathy: a selection of passages from different authors that is compiled as an aid in learning a language
selection: a passage selected from a larger work

Other hypernyms of chrestomathy include excerpt, excerption, extract.

chrestomathy (noun)	selection (noun)
a selection of passages from different authors that is compiled as an aid in learning a language	the act of choosing or selecting
	the person or thing chosen or selected
	a passage selected from a larger work
	an assortment of things from which a choice can be made
	a natural process resulting in the evolution of organisms best adapted to the environment