corral vs pen

corral and pen both are nouns.

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

As nouns, pen is a hypernym of corral; that is, pen is a word with a broader meaning than corral:

corral (noun)	pen (noun)
a pen for cattle	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

corral (verb)	pen (verb)
enclose in a corral	produce a literary work
arrange wagons so that they form a corral
gather and secure