The logical relationship between the words in bold below is;
"Push" and "Pull" are opposites or antonyms.
What is the relationship?
The logical relationship between "Push" and "Pull" is that they are opposites or antonyms. Therefore, following the same logic, the pair of words that represent opposites is fast and slow.
Another logical relationship that follows the same pattern of push and pull is Fast: Slow because they are antonyms. In the English language, we might have to compare words that are opposite in meaning. The above is a typical example because one represents the contrast of the other. So, the logical relationship is that of antonyms.