cross-link vs cross-linkage

cross-link and cross-linkage both are nouns.

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

As nouns, cross-link and cross-linkage are synonyms defined as:

cross-link and cross-linkage: a side bond that links two adjacent chains of atoms in a complex molecule

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

cross-link (verb)	cross-linkage (verb)
join by creating covalent bonds (of adjacent chains of a polymer or protein)