Embedded Monosyllabic Words (or abbreviated as "Embedded Words") refers to a group of monosyllabic words which are easy to combine with other words but they must be used in pairs (i.e., embedded disyllabic prosodic module). They are discovered using new theories. They were regarded as half free morphemes, emphasizing that though they act as members of sentences, they are limited in their distribution and cannot be used independently. This conclusion was based on the fact that the analyzers didn't pay attention to the reasons behind the phenomena. From the perspective of prosodic grammar, these words are monosyllabic words with free syntax and bounded meters. They are created to meet the solemn style and are based on lexical rules. Solemn style is not widely used as formal style or informal style. These words are limited in number, but they reflect that vocabulary must be differentiated based on style.