Letters that make observation post
s, a, o, b, e, n, p, r, t, i, v are letters that make 'observation post'
Words within observation post
ER, RV, vat, os, OS, OB, BS, ti, VA, PO, Post, VAT, at, SE, on, post, observation, Io, ion, Ob, Po, BSE, At, Er, Os, Se, Ti are words within 'observation post'