federal vs government activity

federal is not a noun while government activity is a noun.

Word	Noun	Adjective	Verb	Adverb
federal	No	Yes	No	No
government activity	Yes	No	No	No

federal (noun)	government activity (noun)
	the act of governing; exercising authority

federal (adjective)	government activity (adjective)
characterized by or constituting a form of government in which power is divided between one central and several regional authorities
of or relating to the central government of a federation
national; especially in reference to the government of the United States as distinct from that of its member units