Irks rhymes with:
berkes, birkes, birks, burke's, burkes, burks, clerk's, clerks, clerks', declerck's, declercq's, declerk's, declerque's, deklerk's, derks, dircks, dirkes, dirks, dirkse, jerks, kirk's, kirks, klerk's, lurks, merc's, merck's, overworks, percs, perks, quirks, smirks, turks, work's, works, works'
Irks sounds like:
i'ers, ihrig, ihrke, ira's, iraq, iraq's, iraqi, iraqi's, iraqis, iras, irick, iris, irises, irish, irk, iroquois, iwerks