Nocua is a word of Spanish origin, pronounced as /no.kwa/. Its spelling is phonetically straightforward, with the "n" and "o" sounds pronounced plainly, followed by the "k" sound that is spelled as "cu" in Spanish. The final "a" is pronounced with an open "ah" sound. In Spanish, "n" and "c" are always pronounced distinctly, hence the phonetic spelling "no-kwa." While the meaning of the word is unclear, its spelling is not difficult to grasp with the help of IPA transcription.
Venenosa.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.