yhdyssanakäytäntöön
Yhdyssanakäytäntöön refers to the principles and practices governing the formation and use of compound words in the Finnish language. Finnish is an agglutinative language, meaning it readily forms new words by joining existing ones together. This characteristic makes yhdyssanakäytäntöön a significant aspect of Finnish grammar and orthography.
The fundamental principle of Finnish compound words is that they are written as a single, unseparated word.
There are guidelines to determine when two or more words should be compounded rather than written separately.