My 23 month DD started gathering words at about 17 months and (I think) is doing well - she talks a lot! Mostly pointing and naming words, but putting together 2-3 words sometimes and also uses words functionally to get what she wants etc.
But she can also repeat words. Mostly when she's pointing and wants our attention (when we give it, she stops) and sometimes when she says a word we don't understand... I mean repeating. She can say it over and over.
Also, she has a way of saying people's names (or certain people's names) out of context, like she's been thinking of them. Suddenly say grandma or Marky (her friend) or a case worker at the nursery (she's just started, so quite excited).
Is all this normal stuff at this age? Have no idea!