Word count using map reduce on Seq[String]

Question

I have a Seq which contains randomly generated words.

I want to calculate the occurrence count of each word using map reduce.

Now, I have been able to map the words against a value 1 and grouped them together by words.

val mapValues = ourWords.map(word => (word, 1))
val groupedData = mapValues.groupBy(_._1)

However, I am not sure how to use the reduce function on groupedData to get the count.

I tried this -

groupedData.reduce((x, y) => x._2.reduce((x, y) => x._2) + y._2.reduce((l, r) => l._2))

but it's riddled with errors.