How many words does your 18-month-old say?

Camille

We went to the pediatrician today for my son’s 18 month check up and they asked how many words he is saying. I told them about 5 to 7. She said that’s kind of low and she wants him to say at least 21 words by the time he is 21 months. I know all kids develop at their own pace, my son didn’t start walking until he was 16 months old. Just wondering how many words your 18 month old is saying.