Koostisosa
Koostisosa is a linguistic term used in Estonian to describe a component of a compound word. A compound is formed when two or more morphemes or words are combined to create a new lexical item, and each part of the combination is referred to as a koostisosa. The concept helps describe how the meaning and form of the whole word arise from its parts.
In most Estonian compounds, the rightmost constituent functions as the syntactic head, with the other constituents
Koostisosa can include various types of constituents. They are not limited to full words; some compounds involve
Compounds can be endocentric, where the whole refers to something of the same kind as the head,
Koostisosa thus denotes the building blocks of compound words, helping to analyze how new words are formed