Logogriph
Logogriph , noun
[Greek lo`gos word + gri^fos a fishing net, a dark saying, a riddle: French logogriphe.]
A sort of riddle in which it is required to discover a chosen word from various combinations of its letters, or of some of its letters, which form other words; -- thus, to discover the chosen word chatter form cat, hat, rat, hate, rate, etc. — B. Jonson