Fierce is a Chinese character, pronounced pi ā o hà n; Tough, Chinese word, pronounced biā o hà n.

2. There are differences in meaning.

Fierce means swift, brave and fierce. Describe agile and brave, flexible and brave.

Tough generally describes people as strong and brave, which is a compliment. In network language, there is a meaning of "hard life needs no explanation", which means speechless, strong, nonsense, funny, outrageous and so on.

3. Different sources.

The fierceness comes from Chen Han Tang Biography: "And its fierceness, militant cutting, winning by numbers, and grazing for a long time will be a disaster for the western regions." Among them, wildness means lightness and courage.

The origin of tough: tough itself is a northeast dialect vocabulary.