Koostisõna
Koostisõna is an Estonian term that translates to "compound word" in English. It refers to a word formed by combining two or more existing words, where each constituent word retains its original meaning to some extent, but the new word creates a new, distinct concept. This is a common word formation process in the Estonian language, contributing to its rich vocabulary.
Examples of koostisõnad include "lasteaed" (children's garden, meaning kindergarten), "raudtee" (iron road, meaning railway), and "maailmavaade"
The formation of koostisõnad often follows grammatical rules, such as the first word being in the genitive