Which hybridization is found in ${\mathrm{NH}}_3$ and ${\mathrm{H}}_2\mathrm{O}$?

In Ammonia $\left({\mathrm{NH}}_3\right)$ and ${\mathrm{H}}_2\mathrm{O}$, the central atom is ${\mathrm{sp}}^3$ hybridized.
In NH₃  molecule consists of one $2\mathrm{s}$ orbital and three $2\mathrm{p}$ orbitals of nitrogen combine to form four hybrid orbitals having equivalent energy which is then considered an ${\mathrm{sp}}^3$ type of hybridization.