The word "Moril" may seem confusing to spell, but it can be broken down using IPA phonetic transcription. The initial sound is an unvoiced bilabial fricative, represented by /m/. The next sound is a low-mid central vowel, represented by /ɔ/. The final sound is a voiced alveolar lateral approximant, represented by /l/. So, the correct spelling is "Moril," with an "o" instead of the more typical "a" for the second sound. Knowing how to break down words using phonetics can be helpful in understanding their spelling.
Same as morel, which see.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.