Root ل ج ج(l j j) has 4 unique word forms and appears 4 times in the Quran.

Word Translation Occurrences
لُجَّةٗ (was) a pool 2
لَّجُّواْ they persist 2
لُّجِّيّٖ deep 2
لَّلَجُّواْ surely they would persist 2