sympathomimetic vs adrenergic

sympathomimetic is not a noun while adrenergic is a noun.

Word	Noun	Adjective	Verb	Adverb
sympathomimetic	No	Yes	No	No
adrenergic	Yes	Yes	No	No

As adjectives, sympathomimetic and adrenergic are synonyms defined as:

sympathomimetic and adrenergic: relating to epinephrine (its release or action)

sympathomimetic (noun)	adrenergic (noun)
	drug that has the effects of epinephrine

sympathomimetic (adjective)	adrenergic (adjective)
relating to epinephrine (its release or action)	relating to epinephrine (its release or action)