slaka gismu

x1 is a syllable in language x2.

See also sance, valsi, bangu.

In notes:

bangu
x1 is a/the language/dialect used by x2 to express/communicate x3 (si'o/du'u, not quote).
sance
x1 is sound produced/emitted by x2.
valsi
x1 is a word meaning/causing x2 in language x3; (adjective: x1 is lexical/verbal).