I notice if I linger on the words and contemplate the difference in feeling between the pairs, I feel a shift in me and can feel the energy difference, positive vs negative. I don't feel that with all the pairs as I have not studied them much and I believe some are more contrasting than others and therefore easier to feel.
The more times I hear, read and experience the power of words, the more I realize how important it is to use them properly. And I find it curious how many times I am exposed to different and important themes like this, before I accept and further more internalize it.