The word "Musketrest" is a compound noun that is spelled using the combination of two words: "musket" and "rest". The IPA phonetic transcription of this word is /ˈmʌskətˌrɛst/. The first part of the word is pronounced as "mus-ket" with a short "u" sound and a hard "k" sound. The second part of the word is pronounced as "rest" with a short "e" sound and a soft "s" sound. Therefore, the correct spelling of this word is "Musketrest," not "Musket rest" or "Muskettrest."