Ayn-Waw-Nun (ع-و-ن) has 1 word in the Fahm dictionary: taʿāwana (to cooperate (Form VI)).
In the Quran, words built on this root occur 12 times in 11 verses, across 9 of the 114 suras. The first is in 1:5. The form تَعَاوَنَ (to cooperate (Form VI)) accounts for 2 of them.
They said: Pray for us unto thy Lord that He make clear to us what (cow) she is. (Moses) answered: Lo! He saith, Verily she is a cow neither with calf nor immature; (she is) between the two conditions; so do that which ye are commanded.
And they came with false blood on his shirt. He said: Nay, but your minds have beguiled you into something. (My course is) comely patience. And Allah it is Whose help is to be sought in that (predicament) which ye describe.
Quran 12:18
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).