right of first publication vs copyright

right of first publication and copyright both are nouns.

Word	Noun	Adjective	Verb	Adverb
right of first publication	Yes	No	No	No
copyright	Yes	No	Yes	No

As nouns, right of first publication and copyright are synonyms defined as:

right of first publication and copyright: a document granting exclusive right to publish and sell literary or musical or artistic work

right of first publication (noun)	copyright (noun)
a document granting exclusive right to publish and sell literary or musical or artistic work	a document granting exclusive right to publish and sell literary or musical or artistic work

right of first publication (verb)	copyright (verb)
	secure a copyright on a written work