@blinkbonny also try the words HISTORY and WORLD
If you see two sets of two letters without a space in them, try ST or TH as it's often a number for a century e.g. 21st or 20th. The word before, say, 21st century can often be LATE or EARLY
If you have two letters separated by a . and ending with a . it's often I.E. or E.G.
You will pick up lots of little tips and tricks the more you play it.