The spelling of the word "Assurin" is based on the pronunciation of the word. It is pronounced /əˈʃɔːrɪn/ (uh-SHAW-rin), with the stress on the second syllable. The "ssu" sound is spelled with a single "s" because it is pronounced as a fricative "s" sound rather than a double "s" sound. The "ur" sound is spelled with a single "u" because it is pronounced as a schwa sound (/ə/). The final "in" sound is spelled with an "-in" ending because it is a suffix denoting a person or thing that performs a specific action.