verse vs pen

verse and pen both are nouns.

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

As verbs, pen is a hypernym of verse; that is, pen is a word with a broader meaning than verse:

Other hypernyms of verse include compose, indite, write.

verse (noun)	pen (noun)
a piece of poetry	female swan
a line of metrical text	a writing implement with a point from which ink flows
literature in metrical form	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

verse (verb)	pen (verb)
familiarize through thorough study or experience	produce a literary work
compose verses or put into verse