authorship vs compose

authorship is a noun but compose is not a noun.

Word	Noun	Adjective	Verb	Adverb
authorship	Yes	No	No	No
compose	No	No	Yes	No

authorship (noun)	compose (noun)
the act of creating written works
the act of initiating a new idea or theory or writing

authorship (verb)	compose (verb)
	make up plans or basic details for
	produce a literary work
	write music
	put together out of existing material
	calm (someone, especially oneself); make quiet
	form the substance of