Allophone
In phonology, an allophone ( ; from Ancient Greek ἄλλος (állos) 'other' and φωνή (phōnḗ) 'voice, sound') is one of multiple possible spoken sounds, or phones, used to pronounce a single phoneme in a particular language. For example, in English, the voiceless plosive [t] (as in stop [ˈstɒp]) and the aspirated form [tʰ] (as in top [ˈtʰɒp]) are allophones for the phoneme /t/, while these two are considered to be different phonemes in some languages such as Central Thai.