norepinephrine vs pressor

norepinephrine and pressor both are nouns.

Word	Noun	Adjective	Verb	Adverb
norepinephrine	Yes	No	No	No
pressor	Yes	Yes	No	No

As nouns, pressor is a hypernym of norepinephrine; that is, pressor is a word with a broader meaning than norepinephrine:

norepinephrine: a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses
pressor: any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure

Other hypernyms of norepinephrine include vasoconstrictive, vasoconstrictor, monoamine neurotransmitter, catecholamine.

norepinephrine (noun)	pressor (noun)
a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses	any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure

norepinephrine (adjective)	pressor (adjective)
	increasing (or tending to increase) blood pressure