I found the lexicon kinda useless re propheCy & propheSy.
I found propheCy and PropheSy are allegorically as different as law and grace, or as gloom & groom. PropheCy seems to allegory suggest law and prophets, who mostly predict gloom & doom, aka dis-comfort. PropheSy seems to allegory suggest edify & exhort all men unto comfort (not discomfort).
For example in 1Corinthians 13:8 KJV it notes whether "prophecies", they shall fail. In 1Thessalonians 5:20 it says despise not prophesyings.
It's a difficult subject that seems to require revelation of the Spirit to properly understand it.