There is no need for the verb forms to exist.
Then there is a question whether compression ← decompression synonymization should be done. I think it does, because compression always entails decompression in the same way as encryption and decryption (already synonyms) are two sides of the same coin.
Final proposal:
- compression ← decompression
- compression ← data-compression
- compression ← decompress
- compression ← uncompress

Compress [compress]as its title. Plzz?