Stomatonoma is a medical term commonly used to describe tumors or growths in the mouth. In terms of spelling, it is pronounced /stoʊmətoʊnoʊmə/. The first syllable, "sto," is pronounced with a long "o" sound, followed by "ma" with a short "a" sound. The variety of different vowel sounds in the word can make it difficult to spell, but understanding the phonetic transcription can help. Regular dental checkups can help diagnose and treat any potential stomatonoma growths in the mouth.
Gangrene of the mouth, noma.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.