The type of hybridization indicates the geometry of a molecule. In water molecule, the oxygen atom is sp3hybridized. But water molecule has no tetrahedral geometry. Explain

Bonding pairs of electrons are those electrons that are shared by the central atom and/or to any atom to which it is bonded. Non-bonding pairs of electrons are those pairs of electrons on an individual atom that are not shared with any other atom. Groups is a more generic term. The term electron-pair geometry (or simply geometry) is the name of the geometry of the electron-pair/groups/domains on the central atom, whether they are bonding or non-bonding. Molecular geometry is the name of the geometry used to describe the shape of a molecule. The electron-pair geometry provides a guide to the bond angles of between a terminal-central-terminal atom in a compound whereas the molecular geometry gives the shape of the molecule. 
The geometry of H₂O molecule is tetrahedral due to its sp³ hybridisation. but its shape is bent due to presence of a lone pair on oxygen. The non bonding electrons-bonding pair repulsion is more and that deviates the molecule from the geometry.