instruct – ctenophore
(I had to cheat for this one as I could not find any common English words that started with ct. A ctenophore is a marine jellyfish and the common name is comb jelly.)
almond and always were my first thoughts, but I can’t think of anything that starts with nd or ys. If you can, I’d like to hear what it is, but to keep the game going, I’ll submit