propaganda vs agitprop

propaganda and agitprop both are nouns.

Word	Noun	Adjective	Verb	Adverb
propaganda	Yes	No	No	No
agitprop	Yes	No	No	No

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

propaganda: information that is spread for the purpose of promoting some cause
agitprop: political propaganda (especially communist propaganda) communicated via art and literature and cinema

propaganda (noun)	agitprop (noun)
information that is spread for the purpose of promoting some cause	political propaganda (especially communist propaganda) communicated via art and literature and cinema