The spelling of the word "Compartner" is based on English phonetics. The letter "c" is pronounced as /k/, the letters "o" and "a" as /ɒ/ and /ə/ respectively, and the letter "m" as /m/. The letter "p" is pronounced as /p/, followed by the letter "a" pronounced as /ɑː/. The letter "r" is sounded as /r/ and the final syllable "tner" is pronounced as /tnə/. Therefore, the phonetic transcription for "Compartner" would be /ˈkɒmpɑːtnə/.
The word "Compartner" does not have an established etymology as it is not a commonly used or recognized word in English. It appears to be a combination of the prefix "com-" meaning together or joint, and the word "partner" referring to a person with whom one shares an activity or business relationship. However, it is important to note that "compartner" is not a recognized word in standard English vocabulary.