unlisted security vs over the counter security

unlisted security and over the counter security both are nouns.

Word	Noun	Adjective	Verb	Adverb
unlisted security	Yes	No	No	No
over the counter security	Yes	No	No	No

As nouns, unlisted security and over the counter security are synonyms defined as:

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

Other synonyms of unlisted security include OTC security.

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