This paper investigates semantics and word formation of hybrid words which emerged as new words and trendy words in the Heisei era. Moreover, it includes some hybrid words that remained as public words. Results are summarized as below: First of all, according to a classification of semantics of the words based on Yoneyama (2019), the majority indicates ‘objects (44％)’ followed by ‘humans (26.9%)’ and ‘human activities (20.6%).
Secondly, four kinds of the word formations, ‘compounding’, ‘abbreviation’, ‘blending’ and ‘parody’, were used, and 96.2% of them were created with compounding and abbreviation.
Thirdly, among hybrid words generated from new words and trendy words in the Heisei era, less than only 5% settled as public words. Further, among those settled public words, ‘name of objects’ takes up the largest percentage and no word indicates ‘one’s appearance and personality’.