Studying place names are as important as studying dialects as language materials because they are matched common rules and changes of local languages or dialects. So far, as for place names, the studies of phonology, morphology, coinage, lexicon, etymology have been made as well as abundant research on them in terms of borrowing words and language policy. This study aims at examining phonological approach on place names specifically on deletion and coalescence. Generally, deletion and coalescence of place names are matched with every day words. For example, place names such as '진-골(tʃin-kol)[valley], 가는-골(Kan+n-kol[valley], 소-정이(so-tʃəŋi)[field]' delete "ㄹ(1)“ in front of coronal such as '길-(kil-)+ㄴ(n)+골(kol), 가늘-(kan+l-)+ㄴ(n)+골(kol), 솔(sol)+정이(tʃəŋi).' These deletions are found in every day words as diachronic phenomena. The partial coalescence of place names show the same changes. '붱-바우(pwəŋ-pau)[rock], 붱이-굴(pwəŋi-Kul)[cave]]' and form of coalescence from '부엉이(puəŋi)>붱이(pwəŋi)‘ (by semivowel). However, place names have their own specific characteristics different from every day word in terms of deletion and coalescence. First, '엄남-골(əmnarm-kol)[village], 팽남-샴(phŋnarm-syam)[spring], 해넘-재(hɛnəm-tʃɛ)[hill]' show the same deletion form as ’나무(namu)>남(nam), 너머(nəmə)>넘(nəm)'. Second, word '마을(ma+l)>말(mal)' is discovered in place names nationwide. Although it is restricted in location, '마을(ma+l)>말(mal)>마(ma)' is discovered such as '골-마(kol-ma)[village], 안-마(an-ma)[village], 큰-마(kh+n-ma)[village],' Third, there is a place name such as '바위(paü)(rock, 岩)>바(pa), 바위(paü)>배(pɛ),' ‘물탕-바위(multhaŋ-paü)>물탕-바(multhaŋ-pa) [rock], 줄-바위골(tʃul-paükol)>줄-박골(tʃul-pakkol[valley], 갓-바위(kat-paü)> 갓-바(kat-pa)[rock].' These deletions are not discovered in every day words. They are shown only on place names. Also, there is a coalescence that is shown only in place name such as '궝-말(<궉-말)(kwəŋ-mal)[village], 궉-들(kwək-t +l)[village], 궉-태(kwək-thɛ)[valley]. ' As seen in '구억-말(kuək-mal)[village], and 구억-들(kuək-t+l)[village]' they are developed forms of '구석(kusək)' from '구석>구억>궉(kusək>kuək>kwək). ' That is, these words are special place names that are inferred from 'ㅅ(s)' phonological history. As seen above, place names show special deletion and coalescence because of local specificity that limits the length of place names and titles.
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