creation vs master copy

creation and master copy both are nouns.

Word	Noun	Adjective	Verb	Adverb
creation	Yes	No	No	No
master copy	Yes	No	No	No

As nouns, master copy is a hyponym of creation; that is, master copy is a word with a more specific, narrower meaning than creation:

creation: an artifact that has been brought into existence by someone
master copy: an original creation (i.e., an audio recording) from which copies can be made

creation (noun)	master copy (noun)
the human act of creating	an original creation (i.e., an audio recording) from which copies can be made
the act of starting something for the first time; introducing something new
an artifact that has been brought into existence by someone
the event that occurred at the beginning of something
everything that exists anywhere