functional - working, practical, useful, instrumental⏎
duplicate - copy, reproduce⏎
gimmick - trick, novelty, contrivance⏎
harass - upset, annoy, frighten, intimidate, bully, exert force upon, pressurise, pressurize (a person or people)⏎
learning - development, teaching, coaching, growth, edification, knowledge, experience, discovery⏎
flaw - mistake, imperfection, weakness⏎
kudos - prestige, esteem⏎
guru - expert, sage⏎
expand - grow, broaden, increase⏎
mainstream - usual, normal, main (part), tendency, mass⏎