Tafsir of Ash-Shu`ara' 26:7

زَوْجٍ كَرِ‌يمٍ (noble pair - 26:7). The word زَوْجٍ (zawj) literally means a pair. That is why man and woman, and male and female are called Zawj. Many species of trees have male and female among them. On this basis they can also be called Zawj (زَوْجٍ ). Sometimes the word Zawj is also used for a special kind. On the basis of this meaning all species of trees can be called Zawj. The meaning of Karim is a nice and favourite thing.