MAOI vs isocarboxazid

MAOI and isocarboxazid both are nouns.

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

As nouns, isocarboxazid is a hyponym of MAOI; that is, isocarboxazid 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
isocarboxazid: a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression

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

MAOI (noun)	isocarboxazid (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