nucleophile vs electrophile

[Kendall_Chaffin_3C]

Towards the end of class Lavelle was talking about how H2O is a nucleophile because it has valence electrons on the O but that .. if i remember correctly .. HO2 was an electrophile because of polarization? I'm still very confused by this could someone explain again? Also, is OH a nucleophile or an electrophile?

[Meghna Patel 2L]

H2O is not an electrophile because it is has lone pairs on the central atom and is electron rich. The central atom oxygen is also much more electronegative than the two hydrogen atoms which makes it available to donate electrons- thus, making H2O an nucleophile. OH- is also a nucleophile.

[Samuel_Vydro_1I]

OH- is a nucleaphile because it has three lone pairs that readily available to bond