Build up is used with these nouns as the subject:
anger, backlog, excitement, gas, heat, momentum, plaque, pressure, queue, rage, tension, traffic

Build up is used with these nouns as the object:
alliance, appetite, archive, army, business, clientele, collection, confidence, contact, database, defence, empire, endurance, esteem, expectation, fitness, following, fortune, fund, image, immunity, lead, library, momentum, network, picture, profile, relationship, repertoire, reputation, reserve, resistance, saving, self-confidence, speed, stake, stamina, store, strength, support, suspense, trade, trust