The spelling of the word "oilcoals" is quite peculiar. It is comprised of two distinct words, "oil" and "coals," that have been merged together. The IPA phonetic transcription for this word would be /ɔɪlkəʊlz/. This spelling can be a challenge for those unfamiliar with English compound words. However, it highlights the unique flexibility that English has when forming new words from existing ones. Despite its unusual construction, "oilcoals" can be easily deciphered by breaking it down into its individual components: oil and coals.