Professionally rhymes with:
congressionally, additionally, conditionally, congressionally, constitutionally, conventionally, educationally, exceptionally, fractionally, functionally, generationally, institutionally, intentionally, internationally, irrationally, nationally, nutritionally, operationally, proportionally, rationally, rotationally, traditionally, unconditionally, unconstitutionally, unintentionally
Professionally sounds like:
professional, provisional, provisionally