Synonyms for Broadside (same or very similar meaning)
WordNet sense 1 (an advertisement (usually printed on a page or in a leaflet) intended for wide distribution):
bill, broadsheet, circular, flier, flyer, handbill, throwawayWordNet sense 2 (a speech of violent denunciation):
philippic, tiradeWordNet sense 3 (located on a side):
sideFrom the ODE community, based on WordNetadd/edit