Synonyms for Underwriter (same or very similar meaning)
WordNet sense 1 (a banker who deals chiefly in underwriting new securities):
investment bankerWordNet sense 2 (an agent who sells insurance):
insurance broker, general agent, insurance agentWordNet sense 3 (a financial institution that sells insurance):
insurer, insurance company, insurance firm, insurance underwriterFrom the ODE community, based on WordNetadd/edit