a difference of a single word ❍ 这里看来只有～，一个要下马，一个要上马，却是表现了两条路线的分歧。(《毛泽东选集》Ⅴ-187) There is a difference of only a single word here—one says“off”while the other says “on”—yet it demonstrates the difference between two opposing lines.
一字之差yī zì zhī chā
形容只有一个字的差错。there is a difference of only a single word, a difference of word