MAO vs monoamine oxidase

MAO and monoamine oxidase both are nouns.

Word	Noun	Adjective	Verb	Adverb
MAO	Yes	No	No	No
monoamine oxidase	Yes	No	No	No

As nouns, MAO and monoamine oxidase are synonyms defined as:

MAO and monoamine oxidase: an enzyme that catalyzes the oxidation of many body compounds (e.g., epinephrine and norepinephrine and serotonin)

MAO (noun)	monoamine oxidase (noun)
an enzyme that catalyzes the oxidation of many body compounds (e.g., epinephrine and norepinephrine and serotonin)	an enzyme that catalyzes the oxidation of many body compounds (e.g., epinephrine and norepinephrine and serotonin)