cross-index vs quotation

cross-index and quotation both are nouns.

Word	Noun	Adjective	Verb	Adverb
cross-index	Yes	No	Yes	No
quotation	Yes	No	No	No

As nouns, quotation is a hypernym of cross-index; that is, quotation is a word with a broader meaning than cross-index:

cross-index: a reference at one place in a work to information at another place in the same work
quotation: a short note recognizing a source of information or of a quoted passage

Other hypernyms of cross-index include acknowledgment, citation, cite, credit, mention, reference.

cross-index (noun)	quotation (noun)
a reference at one place in a work to information at another place in the same work	the practice of quoting from books or plays etc.
	a passage or expression that is quoted or cited
	a short note recognizing a source of information or of a quoted passage
	a statement of the current market price of a security or commodity

cross-index (verb)	quotation (verb)
make an index that refers from one point to the next