vein vs cardiovascular system

vein and cardiovascular system both are nouns.

Word	Noun	Adjective	Verb	Adverb
vein	Yes	No	Yes	No
cardiovascular system	Yes	No	No	No

vein (noun)	cardiovascular system (noun)
one of the horny ribs that stiffen and support the wing of an insect	the organs and tissues involved in circulating blood and lymph through the body
a blood vessel that carries blood from the capillaries toward the heart
a distinctive style or manner
a layer of ore between layers of rock
any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ

vein (verb)	cardiovascular system (verb)
make a veinlike pattern