persecution vs pogrom

persecution and pogrom both are nouns.

Word	Noun	Adjective	Verb	Adverb
persecution	Yes	No	No	No
pogrom	Yes	No	No	No

As nouns, pogrom is a hyponym of persecution; that is, pogrom is a word with a more specific, narrower meaning than persecution:

persecution: the act of persecuting (especially on the basis of race or religion)
pogrom: organized persecution of an ethnic group (especially Jews)

Other hyponyms of persecution include oppression, subjugation, torture, torturing.

persecution (noun)	pogrom (noun)
the act of persecuting (especially on the basis of race or religion)	organized persecution of an ethnic group (especially Jews)