Question

what is the difference between the words finish and complete

Answer 1

Key difference: The words finish and complete means same, but differ slightly in their explanation contexts. The word ‘finish’ means anything which is just finish then that may relate to any part of an entire task or work. While, the word ‘complete’ means done with everything, which relates to the overall completion of any task or work. 

The difference between the words, finish and complete is rarely found due to their similar meanings.

Answer 2

he finished his homework
he completed his homework

completed- finish making or doing
finished-brought to end