نَافِلَة
Appears 2 times in the Quran.
(Root: نفل)
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17:79 وَمِنَ ٱلَّيْلِ فَتَهَجَّدْ بِهِۦ نَافِلَةً لَّكَ عَسَىٰٓ أَن يَبْعَثَكَ رَبُّكَ مَقَامًا مَّحْمُودًا
And during a part of the night, pray Tahajjud beyond what is incumbent on you; maybe your Lord will raise you to a position of great glory.
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And We gave him Ishaq and Yaqoub, a son's son, and We made (them) all good.