Letters that make counterproductive
o, d, e, n, p, c, r, t, i, u, v are letters that make 'counterproductive'
Words within counterproductive
ER, product, prod, OD, ti, te, PR, NT, UN, duct, Ro, productive, pro, counter, iv, count, CT, IV, rod, CO, Co, Er, Pr, Te, Ti are words within 'counterproductive'