A syllabary is a set of written symbols that represent the syllables or (more frequently) moras which make up words. A symbol in a syllabary, called a syllabogram, typically represents an (optional) consonant sound (simple onset) followed by a vowel sound (nucleus)—that is, a CV or V syllable—but other phonographic mappings such as CVC and CV-tone are also found in syllabaries.

Read more about Syllabary:  Types, Languages Using Syllabaries, Difference From Abugidas, Comparison To English Alphabet