'Am responsible for' is a phrase that is often used in job descriptions and resumes to describe the tasks and duties of an individual. However, to avoid repetition and monotony in writing, it is important to use synonyms for this phrase. Some of the synonyms for 'am responsible for' are 'accountable for', 'in charge of', 'tasked with', 'entrusted with', 'obligated to', and 'answerable for'. These synonyms add variety to the language and make the writing more engaging and interesting. It is important to note that the synonym used should be appropriate to convey the intended meaning and not change the context of the sentence.