heterocycle vs indole

heterocycle and indole both are nouns.

Word	Noun	Adjective	Verb	Adverb
heterocycle	Yes	No	No	No
indole	Yes	No	No	No

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

heterocycle: a compound containing a heterocyclic ring
indole: a white or yellowish crystalline heterocyclic compound extracted from coal tar and used in perfumery, medicine, and as a flavouring agent.

Other hyponyms of heterocycle include chelate, chelate compound, lactide.

heterocycle (noun)	indole (noun)
a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon	a white or yellowish crystalline heterocyclic compound extracted from coal tar and used in perfumery, medicine, and as a flavouring agent.
a compound containing a heterocyclic ring