peacekeeping mission vs armed forces

peacekeeping mission and armed forces both are nouns.

Word	Noun	Adjective	Verb	Adverb
peacekeeping mission	Yes	No	No	No
armed forces	Yes	No	No	No

peacekeeping mission (noun)	armed forces (noun)
the activity of keeping the peace by military forces (especially when international military forces enforce a truce between hostile groups or nations)	the military forces of a nation