Student or Learner
Is it correct to say like this? Is 'from' correct?
We can look up a word from an online dictionary.
The word that you find might come from the dictionary, but when you look it up, you look it up "in" the dictionary (you open up the dictionary and look inside). The online dictionary might not be made of paper, but the analogy still holds.
We can look up a word in an online dictionary.