zero coupon security vs zero-coupon security

zero coupon security and zero-coupon security both are nouns.

Word	Noun	Adjective	Verb	Adverb
zero coupon security	Yes	No	No	No
zero-coupon security	Yes	No	No	No

As nouns, zero coupon security and zero-coupon security are synonyms defined as:

zero coupon security and zero-coupon security: a security that makes no interest payments but instead is sold at a deep discount from its face value

zero coupon security (noun)	zero-coupon security (noun)
a security that makes no interest payments but instead is sold at a deep discount from its face value	a security that makes no interest payments but instead is sold at a deep discount from its face value