Hittite had four labialized obstruents&colon; two velar plosives and two uvular fricatives. Initial affricates and fricatives become final plosives. The plosives have voiced allophones after nasals. Unlike plosives and affricates, labiodental nasals are common across languages. All plosives and fricatives in Muscogee can be geminated (lengthened). Breton has a series of 'interchangeable' consonants, composed of plosives and fricatives. Continuants contrast with occlusives, such as plosives, affricates and nasals. However, there are several languages who show fricatives and even plosives in syllable nuclei. Middle Japanese had a series of prenasalized voiced plosives and fricatives&colon; . Whether they were plosives or fricatives at first is therefore not clear. Here, most languages have retroflex plosives, nasal and approximants. No lenition of intervocalic plosives (e.g. Lat. The voiceless plosives are pronounced with aspiration. The Tamil script does not differentiate voiced and unvoiced plosives. Stops (also referred to as plosives) are consonants where the airstream is completely obstructed.