The spelling of the phrase "doeth work of" appears to be archaic, and is not commonly used in modern English. The word "doeth" is an older form of the word "does," which is the third person singular present tense of the verb "do." It is pronounced as /dʌθ/ in IPA phonetic transcription. The phrase "work of" is spelled simply as it sounds, and refers to the act of completing a task or job. Together, the phrase "doeth work of" means to carry out a specific task or assignment.