واجمَع عَلَى نُورٍ ونِيرَانٍ نِيَار

نِيَرَةٌ أنوَارٌ ِإذَا جَمَعتَ نَار

Count nūr, nīrān, and niyār among its plurals;

Niyāra and anwār as well, when you pluralize nār.

وَمِن جُمُوعِ النَّارِ أيضاً أنوُرُ

وأنَثنَّهَا وقَد تُذَكَّرُ

And anwur, too, is among the plurals of nār;

Treat it as feminine, though it may also be masculine.