smoke screen vs concealment

smoke screen and concealment both are nouns.

Word	Noun	Adjective	Verb	Adverb
smoke screen	Yes	No	No	No
concealment	Yes	No	No	No

As nouns, concealment is a hypernym of smoke screen; that is, concealment is a word with a broader meaning than smoke screen:

Other hypernyms of smoke screen include concealing, hiding.

smoke screen (noun)	concealment (noun)
an action intended to conceal or confuse or obscure	the activity of keeping something secret
(military) screen consisting of a cloud of smoke that obscures movements	a covering that serves to conceal or shelter something
	the condition of being concealed or hidden