Answer:
Convert as used in the sentence is a noun. The accent is placed on syllable "Con"
Step-by-step explanation:
A noun is a name of a person, animal place or thing. We have different types of noun which includes, proper noun, common noun, collective noun, abstract noun, possessive noun. In the sentence, "convert" shows what Ben is that is the name of what he became when he was ten years old. It also answers the question "what".