U. S. Army vs Special Forces

U. S. Army and Special Forces both are nouns.

Word	Noun	Adjective	Verb	Adverb
U. S. Army	Yes	No	No	No
Special Forces	Yes	No	No	No

U. S. Army (noun)	Special Forces (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	a division of the United States Army that is specially trained for guerilla fighting