Going through the alphabet one letter at a time might help you remember it. When you come to the initial letter of the word, your memory might be jogged enough to help you complete the two-step process and remember the sound of the word you’re looking for. When you use an incorrect word that sounds similar to the word you mean to say, your brain has erred in the second step, when you were looking for the actual sound of the word. So, for instance, if you said “Moment of Silence” instead of “Moment of Science” when you were talking about this show, your brain would have successfully completed the conceptual stage of the word-retrieval process but then would have made a slip during the second stage by choosing another similar sounding word that was more familiar than the word you needed.