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First syllable omission also occurs in derived nouns.
In some of these nouns, the omission is optional, but in
some others obligatory. This is described in the following
three sections.
[i]. Optional Omission. The omission of the initial
syllable of nouns derived by -eun- is optional when the
first syllable is seu- and the second syllable begins with
[1]. A form of this kind is found when -eun- is infixed in a
stem beginning with an [s] or [t] and the initial syllable
is closed with a nasal consonant.
sanggoi 'to put one's hair up in a knot or a bun;'
seunanggoi or seulanggoi or langgoi 'bun (of hair)'
tumpoK 'to pile up;' teunumpok or seunumpok 'pile;'
seulumpok or lumpok 'pile of rice sheaves'
tampai 'to patch;' teunampai or seunampai or seulampai
or lamoai 'patch'
[ii]. More Common Forms. When -eun- is infixed into
one-syllable words beginning with a bilabial consonant or a
liquid, the consonant of the reduplicative prefix (which is
added to form two-syllable stems) is always replaced by an
[s], resulting in three-syllable nouns beginning with
initial syllable seu-. These are the kind of words whose
first syllables can be omitted. Between the two forms
(complete and with the first syllable omitted), the form
i