cross-link vs conjoin

cross-link is a noun but conjoin is not a noun.

Word	Noun	Adjective	Verb	Adverb
cross-link	Yes	No	Yes	No
conjoin	No	No	Yes	No

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

cross-link: join by creating covalent bonds (of adjacent chains of a polymer or protein)
conjoin: make contact or come together

Other hypernyms of cross-link include join.

cross-link (noun)	conjoin (noun)
a side bond that links two adjacent chains of atoms in a complex molecule

cross-link (verb)	conjoin (verb)
join by creating covalent bonds (of adjacent chains of a polymer or protein)	make contact or come together
	take in marriage; married