The correct spelling of the word "more thirdstring" is /mɔːr ðɜːdstrɪŋ/. The first part, "more", is spelled with the digraph "or" as it represents the long vowel sound /ɔː/. The second part, "thirdstring", is hyphenated to show that it is a compound word made up of "third" and "string". "Third" is spelled with the voiced dental fricative /ð/ and "string" with the voiced alveolar stop /d/ and the voiced alveolar nasal /n/.