cross-refer vs advert

cross-refer is not a noun while advert is a noun.

Word	Noun	Adjective	Verb	Adverb
cross-refer	No	No	Yes	No
advert	Yes	No	Yes	No

As verbs, advert is a hypernym of cross-refer; that is, advert is a word with a broader meaning than cross-refer:

cross-refer: refer from one entry to another, as in catalogues, books, and lists
advert: make reference to

Other hypernyms of cross-refer include bring up, cite, mention, name, refer.

cross-refer (noun)	advert (noun)
	a public promotion of some product or service

cross-refer (verb)	advert (verb)
refer from one entry to another, as in catalogues, books, and lists	make a more or less disguised reference to
	make reference to
	give heed (to)