WordNet sense 1 (a common and long cultivated European herb from which most common garden pansies are derived):

Johnny-jump-up, love-in-idleness, wild pansy, pink of my John, Viola tricolor

WordNet sense 2 (violet of Pacific coast of North America having white petals tinged with yellow and deep violet):

two-eyed violet, Viola ocellata

WordNet sense 3 (common Old World viola with creamy often violet-tinged flowers):

field pansy, Viola arvensis

WordNet sense 4 (the absence of mental stress or anxiety):

peace, peacefulness, repose, serenity, ataraxis, peace of mind