There are several synonyms for the term "employ oneself in". These includes "engage in", "occupy oneself with", "work at", "pursue", "undertake", "apply oneself to", "devote oneself to", "busy oneself with", "involve oneself in", "immerse oneself in", "commit oneself to", "shoulder", "take on" and "embark on". All these synonyms have varying nuances and are used depending on the context. The word "employ" implies a more formal engagement, while other terms may imply a leisurely or casual pursuit. Understanding and using the right synonym can help to add depth and nuance to one's language.