opening move vs beginning

opening move and beginning both are nouns.

Word	Noun	Adjective	Verb	Adverb
opening move	Yes	No	No	No
beginning	Yes	Yes	No	No

As nouns, beginning is a hypernym of opening move; that is, beginning is a word with a broader meaning than opening move:

Other hypernyms of opening move include commencement, start.

opening move (noun)	beginning (noun)
the first of a series of actions	the act of starting something
	the first part or section of something
	the event consisting of the start of something
	the place where something begins, where it springs into being
	the time at which something is supposed to begin

opening move (adjective)	beginning (adjective)
	serving to begin