hello jonardhan..,

as you know that, nucleophilicity depends on many factors, including charge, basicity, solvent, polarizability, and the nature of the substituents. Nucleophiles can be neutral or negatively charged. For example, the O in OH - is negatively charged, but the O in H 2 O is neutral.  also a nucleophile containing a negatively charged reactive atom is better than a nucleophile containing a reactive atom that is neutral. while moving across a row in the periodic table, the nucleophilicity follows basicity.

the the decreasing order of nucleophilicity follows the order

-CH3>-NH2>-OH>-F

Hope this information was useful to you.

all the best