وَالنَّجْمُ وَالشَّجَرُ يَسْجُدَانِ
And the stemless plants and the trees submit in prostration.
Here al-najm means vegetation without a trunk; it truly belongs with al-shajar, the trees. Yet because the sun and moon have already been mentioned, the hearer may momentarily associate najm with a star, giving an additional apparent association with celestial bodies.
Īhām al-tanāsub depends on an affinity suggested by a sense that is not the intended sense. In this instance the botanical association is intended, while the stellar association arises as an impression.