unlisted security vs OTC security

unlisted security and OTC security both are nouns.

Word	Noun	Adjective	Verb	Adverb
unlisted security	Yes	No	No	No
OTC security	Yes	No	No	No

As nouns, unlisted security and OTC security are synonyms defined as:

unlisted security and OTC security: a security traded in the over-the-counter market

Other synonyms of unlisted security include over the counter security.

unlisted security (noun)	OTC security (noun)
a security traded in the over-the-counter market	a security traded in the over-the-counter market