"big words" are fine, so long as you are using the words that your audience understands. You need to speak to your audience. You could always use those words,

"big words" are fine, so long as you are using the words that your audience understands. You need to speak to your audience. You could always use those words, and explain the definition/meaning as a side-note, which would be more inclusive without losing the expressiveness. It's often through explaining the need for a big word, that people realise there are smaller, better known words, that work just as well - they just don't look as 'clever'.