We don't have synonyms for securitise yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are securitize, securite and securities.
(v) :
Alternative spelling of securitize. [(finance) To convert assets or claims (typically outstanding loans or other receivables) to securities, usually by selling them with a discount to a financial intermediary, which pools them with other similar assets and sells further as securities to third-party investors.]
(v) :
Alternative spelling of securitize. [(finance) To convert assets or claims (typically outstanding loans or other receivables) to securities, usually by selling them with a discount to a financial intermediary, which pools them with other similar assets and sells further as securities to third-party investors.]