In CH4, C has no lone pairs, the electron density is zero since it is equally distributed.
in CH3OH, O has 2 lone pairs.
In PH2F, F has 3 lone pairs
In NOH, N has 1 lone pair, in this case, oxygen has more lone pairs than N as such the electron density of oxygen is higher than that of nitrogen.
*Reference pictures to see how they each connect.
