angiotensin converting enzyme vs angiotensin-converting enzyme

angiotensin converting enzyme and angiotensin-converting enzyme both are nouns.

Word	Noun	Adjective	Verb	Adverb
angiotensin converting enzyme	Yes	No	No	No
angiotensin-converting enzyme	Yes	No	No	No

As nouns, angiotensin converting enzyme and angiotensin-converting enzyme are synonyms defined as:

angiotensin converting enzyme and angiotensin-converting enzyme: proteolytic enzyme that converts angiotensin I into angiotensin II

Other synonyms of angiotensin converting enzyme include ACE.

angiotensin converting enzyme (noun)	angiotensin-converting enzyme (noun)
proteolytic enzyme that converts angiotensin I into angiotensin II	proteolytic enzyme that converts angiotensin I into angiotensin II