When it comes to describing someone's involvement or participation in something, "has a part in" is just one way to phrase it. Other synonyms for this phrase include "plays a role," "contributes to," "is involved in," "takes part in," and "has a hand in." Each of these variations can provide a slightly different nuance or meaning, depending on the context in which they are used. For example, "contributes to" may suggest a more active form of involvement, while "has a hand in" can imply a less direct or explicit role. Regardless of which synonym you choose, using a variety of phrases to describe involvement can help to keep your writing interesting and fresh.