Translation of "Sanavarasto" in English

Pienillä lapsilla on pieni sanavarasto.

- A young child has a small vocabulary.
- Very young children don't know many words.

Sanoisin kolmen tuhannan sanan olevan melko laaja sanavarasto, josta on hyvä lähteä kehittämään.

I'd say a vocabulary of three thousand is particularly solid and certainly a good starting point.