pen vs paragraph

pen and paragraph both are nouns.

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

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

pen (noun)	paragraph (noun)
female swan	one of several distinct subdivisions of a text intended to separate ideas; the beginning is usually marked by a new indented line
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)	paragraph (verb)
produce a literary work	write paragraphs; work as a paragrapher
	write about in a paragraph
	divide into paragraphs, as of text