Qaf-Mim-Ra (ق-م-ر) has 1 word in the Fahm dictionary: qamarun (moon).
In the Quran, words built on this root occur 27 times in 26 verses, across 23 of the 114 suras. The first is in 6:77. The form قَمَرٌ (moon) accounts for all of them.
And when he saw the moon uprising, he exclaimed: This is my Lord. But when it set, he said: Unless my Lord guide me, I surely shall become one of the folk who are astray.
He is the Cleaver of the Daybreak, and He hath appointed the night for stillness, and the sun and the moon for reckoning. That is the measuring of the Mighty, the Wise.
He it is Who appointed the sun a splendour and the moon a light, and measured for her stages, that ye might know the number of the years, and the reckoning. Allah created not (all) that save in truth. He detaileth the revelations for people who have knowledge.
Quran 10:5
Arabic text: Tanzil Quran Text (Uthmani 1.1), CC BY 3.0, tanzil.net. English: Marmaduke Pickthall, The Meaning of the Glorious Koran (1930), public domain, via Project Gutenberg. Counts and verse choice: Quranic Arabic Corpus morphology data (corpus.quran.com).