Currently, the cryptogram tag is the primary tag, with synonyms code and cipher - it shouldn't be, though.
Cryptograms refer to a specific type of puzzle: one in which each letter has been replaced with another letter (or number, symbol, etc.). Cryptograms are always simple substitution ciphers. However, many of the puzzles in our cryptograms tag are unrelated to cryptograms. They could be tagged as ciphers or steganography, but cryptograms are a subtype of cipher, not a synonym.
What should we do about this?