	Morphemes differ from words in that many morphemes may not be able to stand alone. The Sprint name is composed of a single word and a single morpheme. Conversely, a brand like Acuvue is composed of two morphemes, each with a distinct meaning. While "vue" may be able to stand as its own word, "acu" is seen as a prefix or a bound morpheme that must connect to a free morpheme like "vue."