كَأَنَّ مُثَارَ النَّقْعِ فَوْقَ رُؤُوسِنَا وَأَسْيَافَنَا لَيْلٌ تَهَاوَى كَوَاكِبُهُ
The stirred dust above our heads and our swords seem like a night whose stars are falling.
Calling only the swords “stars” loses the larger setting. The dust forms a dark field while flashing swords move within it like falling stars; the common aspect lies in an integrated arrangement.
A complete answer may identify local correspondences but should conclude by reconstructing the composite image. The artistic comparison concerns an overall scene rather than a single isolated noun.