Answer
As a base, phenolate is stronger than ammonia.
Work Step by Step
As we calculated in 16.75a, the Kb of phenolate is $7.7 \times 10^{-5}$ and if we look at the appendix D in the book, the Kb of ammonia is: $1.8 \times 10^{-5}$, which means that phenolate is a stronger base.
