This is the 841st most frequent Estonian word.
vastus
Answer.
Here, 'vastuse' is the singular form in partitive case, used to denote 'an answer'.
Õpetaja küsimusele sain ma kiiresti vastuse.
I quickly got an answer to the teacher's question.
In this sentence, 'vastus' is in singular nominative case, used to denote the subject of the action, which is 'answer'.
Tema vastus küsimusele oli väga täpne.
His answer to the question was very precise.
The word 'vastust' appears in singular partitive case, indicating an object that is indefinite, as 'an answer'.