The word "ensing" is spelled with a "s" instead of a "c" due to the phonetic transcription of the sound "s" in the word. In IPA, the word is transcribed as [ˈɛnsɪŋ], with the phoneme /s/ representing the "s" sound. This word is not commonly used, but can be seen in certain contexts such as poetry or literature. While the spelling may seem different, it is simply a reflection of the word's pronunciation.