The correct order of nucleophilicity is

$\displaystyle \mathrm{F}^{-}>\mathrm{OH}^{-}$

$\displaystyle \mathrm{H}_2 \underset{\cdot\cdot}{\overset{\cdot\cdot}{\mathrm{O}}}>\mathrm{OH}^{-}$

$\displaystyle \mathrm{R} \underset{\cdot\cdot}{\overset{\cdot\cdot}{\mathrm{O}}} \mathrm{H}>\mathrm{RO}^{-}$

$\displaystyle \mathrm{NH}_2^{-}>\mathrm{NH}_3$