The word "topcastle" is spelled as /tɑpˈkæsəl/. The first syllable, "top," is pronounced with a short "o" sound as in "hot" and a "p" sound. The second syllable, "castle," is pronounced as it is spelled with a "k" sound, a short "a" sound as in "cat," and a "sle" sound. Together, the word refers to the uppermost part of a castle. Correct spelling is necessary to communicate effectively in writing and to aid in properly pronouncing unfamiliar words.