broad arrow vs marking

broad arrow and marking both are nouns.

Word	Noun	Adjective	Verb	Adverb
broad arrow	Yes	No	No	No
marking	Yes	No	No	No

As nouns, marking is a hypernym of broad arrow; that is, marking is a word with a broader meaning than broad arrow:

Other hypernyms of broad arrow include mark, marker.

broad arrow (noun)	marking (noun)
an arrow with a wide barbed head	evaluation of performance by assigning a grade or score
a mark shaped like an arrowhead; used to mark convicts' clothing	the act of making a visible mark on a surface
an arrowhead mark identifying British government property	a pattern of marks
	a distinguishing symbol