I started playing this game two days ago and quickly fell in love with it. It's such an amazing concept and is well executed. Some things I have found to be very helpful in this game are: to try and use the letters that will open more chambers but don't spend too long trying to think of one word. Using really big words like xylophones, personality, strawberries, interestingly, etc. Also if you're in a bind just typing a whole lot of short words one after another can save you. I tend to think of a phrase then type each word in it really fast to help out. I hope this helps and constructive criticism is welcome
I use subterranean, geographical, tyrannosaurus and preposterous quite a lot. And by the way, you might find the game does not know that many words, for example it says melliferous is not a real word.
Also, defiantly go to dictionary.com to get the word of the day. I use it every round when I have some of those letters in the chamber. Also, it is useful to memorize at least five words that start/use frustrating letters in your boiler. I currently have a Q,Z & W, so in the back of my mind before the round I think of some good words with those letters for when I am stuck!