Often. In English, there are many words that contain silent letters. This is one. It’s supposed to be “OFF-en.” The “t” is completely silent.
Is the T silent in water?
It depends. The “t” in water and matter can be pronounced correctly a few different ways. Different dialects will pronounce the “t” as the the traditional letter T is pronounced /t/, but it is most commonly pronounced as an Alveolar flap , /ɾ/, and in some dialects you will here is glotallized as a Glottal stop /ʔ/.
