The word "hassen" is spelled with two S's and pronounced as /ˈhasən/ in IPA phonetic transcription. The initial H is pronounced with a slight breathy sound, while the A is pronounced as a short vowel. The first S is pronounced as a voiceless sibilant, similar to the sound at the end of "cats." The second S is pronounced as a voiced sibilant, similar to the sound at the end of "buzz." Together, the combination of sounds produces the word "hassen" with its distinct pronunciation and spelling.