marking vs broad arrow

marking and broad arrow both are nouns.

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

As nouns, broad arrow is a hyponym of marking; that is, broad arrow is a word with a more specific, narrower meaning than marking:

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