DD2 was 18mo yesterday and has quite a lot now that I think about it, around 30+ too. A few groups of words like love you, see ya and ready, set, go. She also has about 10 signs which we began from birth due to our journey with DD1. I wouldn't be worried to the point of seeking a professional till around 2 though if things were different because coming from the experience of my DD1 having speech therapy from 2.5 (where she had no verbal words) till now there is not much you can really do before they have the concentration and motivation to participate and it is the average point of word explosion but if you need to go public it might be worth getting your name in now in case of long waiting lists. I would also consider looking into signing as that is a great first step to bridging any communication gaps in the meantime.