compose vs pen

compose is not a noun while pen is a noun.

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

As verbs, compose and pen are synonyms defined as:

Other synonyms of compose include indite, write.

compose (noun)	pen (noun)
	female swan
	a writing implement with a point from which ink flows
	an enclosure for confining livestock
	a correctional institution for those convicted of major crimes
	a portable enclosure in which babies may be left to play

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