broad arrow vs marker

broad arrow and marker both are nouns.

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

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

Other hypernyms of broad arrow include mark, marking.

broad arrow (noun)	marker (noun)
an arrow with a wide barbed head	some conspicuous object used to distinguish or mark something
a mark shaped like an arrowhead; used to mark convicts' clothing	a writing implement for making a mark
an arrowhead mark identifying British government property	a distinguishing symbol