Love Thy Neighbor
One admonition I hear a lot is "but love thy neighbor." This is what the original Greek says (using the Verbum app and Strong's Concordance).
What word is used in the phrase?

The word is πλησίον (plésion):

Strong's Exhaustive Concordance
πλησίον (plésion): near, neighbor.
Neuter of a derivative of pelas (near); (adverbially) close by; as noun, a neighbor, i.e. Fellow (as man, countryman, Christian or friend) – near, neighbour.