pen vs rewrite

pen and rewrite both are nouns.

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

As verbs, rewrite is a hyponym of pen; that is, rewrite is a word with a more specific, narrower meaning than pen:

pen (noun)	rewrite (noun)
female swan	something that has been written again
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

pen (verb)	rewrite (verb)
produce a literary work	write differently; alter the writing of
	rewrite so as to make fit to suit a new or different purpose