What do aerobic respiration and lactic acid fermentation have IN COMMON, besides the production of ATP?

The common product in both aerobic respiration and lactic acid fermentation are they are converted into pyruvate.

Explanation: 

Aerobic respiration: A chemical process in which oxygen is used to make energy from carbohydrates (sugars). Also called aerobic metabolism, cell respiration, and oxidative metabolism . Glycolysis produces 2 ATP, 2 NADH, and 2 pyruvate molecules: Glycolysis, or the aerobic catabolic breakdown of glucose, produces energy in the form of ATP, NADH, and pyruvate, which itself enters the citric acid cycle to produce more energy. 

Glycolysis occurs in both aerobic and anaerobic states. In aerobic conditions, pyruvate enters the citric acid cycle and undergoes oxidative phosphorylation leading to the net production of 32 ATP molecules. 

Lactic acid fermentation: In anaerobic conditions, pyruvate converts to lactate through anaerobic glycolysis.