MAOI vs Marplan

MAOI and Marplan both are nouns.

Word	Noun	Adjective	Verb	Adverb
MAOI	Yes	No	No	No
Marplan	Yes	No	No	No

As nouns, Marplan is a hyponym of MAOI; that is, Marplan is a word with a more specific, narrower meaning than MAOI:

MAOI: any of a group of antidepressant drugs that inhibit the action of monoamine oxidase in the brain and so allow monoamines to accumulate
Marplan: a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression

Other hyponyms of MAOI include iproclozide, isocarboxazid, Nardil, phenelzine, tranylcypromine.

MAOI (noun)	Marplan (noun)
any of a group of antidepressant drugs that inhibit the action of monoamine oxidase in the brain and so allow monoamines to accumulate	a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression