Congressional rhymes with:
concessional, confessional, nonprofessional, obsessional, processional, professional, unprofessional, aberrational, additional, binational, coeducational, compositional, computational, concessional, conditional, confessional, conformational, confrontational, congregational, connotational, constitutional, conventional, conversational, correctional, denominational, depositional, devotional, dimensional, directional, dysfunctional, educational, emotional, exceptional, factional, fictional, fluxional, foundational, fractional, functional, generational, gravitational, improvisational, informational, inspirational, institutional, instructional, intentional, intergenerational, internacional, international, internatonal, investigational, invitational, irrational, jurisdictional, motivational, multinational, national, navigational, nonprofessional, nontraditional, nutritional, obsessional, occupational, operational, optional, organizational, processional, professional, promotional, proportional, rational, recreational, relational, representational, rotational, sectional, sensational, situational, supranational, traditional, transformational, transitional, transnational, unconditional, unconstitutional, unconventional, unemotional, unintentional, unprofessional, untraditional, vocational