Catecholamine and Epinephrin

Catecholamine noun - Any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland.

Epinephrin and catecholamine are semantically related. In some cases you can replace term "Epinephrin" with "Catecholamine", this nouns are similar.

Epinephrin noun - A catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action.

Catecholamine and epinephrin are semantically related. You can use "Catecholamine" instead a noun "Epinephrin".