Phenols generally have lower pKa values than aliphatic alcohols owing to phenoxide ion stabilization by resonance that delocalizes charge into the aromatic ring.
Draw all the resonance contributors for the phenoxide ion below. Draw only one of the two equivalent "Kekule benzene structures".
Include all valence lone pairs in your answer. Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner.