What is the difference between fear and dread?
Abraham did not tell Issac everything he knew about what was to happen on the mountain. We cannot be sure why he withheld that information. Maybe spare his son unnecessary fear or dread.
- KHRISLv 51 十年前最愛解答
i also agree they are almost equivalent (perhaps there's some slight difference that i dunno). one of the reasons i can imagine is the writer is trying to stress. by putting 2 adjectives in similar meanings together he adds more force to the meaning 'fear'. another famous example is the simultaneous use of SIMPLE and EASY:
e.g. It's simple and easy to bake a cake. Try it yourself!
in this occasion we both understand 'simple' and 'easy' are synonyms...do you think the writer can better express the meaning 'baking a cake is exceptionally easy' by using 'simple' or 'easy' alone?
this way of stress is better than repeating the same word, because it's more comfortable to read if they are different words but of similar senses.
i hope i can help a little bit.資料來源： myself