collateral vs accompanying

collateral is a noun but accompanying is not a noun.

Word	Noun	Adjective	Verb	Adverb
collateral	Yes	Yes	No	No
accompanying	No	Yes	No	No

As adjectives, collateral and accompanying are synonyms defined as:

collateral and accompanying: occurring with or following as a consequence

Other synonyms of collateral include attendant, concomitant, consequent, ensuant, incidental, resultant, sequent.

collateral (noun)	accompanying (noun)
a security pledged for the repayment of a loan

collateral (adjective)	accompanying (adjective)
descended from a common ancestor but through different lines	occurring with or following as a consequence
situated or running side by side
additional but secondary; auxiliary;
occurring with or following as a consequence
serving to support or corroborate