The spelling of the word "stopneedle" can be explained using the International Phonetic Alphabet (IPA). The word is pronounced as /ˈstɒpniːdl/, with the first syllable being stressed. The "s" sound is represented by the IPA symbol /s/, while the "t" sound is represented by /t/. The "o" sound is represented by /ɒ/ and the "e" sound is represented by /iː/. The letters "n" and "l" represent the sounds /n/ and /l/ respectively. This unique combination of sounds gives us the word "stopneedle".