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Synonyms for Answer (same or very similar meaning)

WordNet sense 1 (a statement (either spoken or written) that is made in reply to a question or request or criticism or accusation):
reply, response

WordNet sense 2 (a statement that solves a problem or explains how to solve the problem):
resolution, result, solution, solvent

WordNet sense 3 (be sufficient; be adequate, either in quality or quantity):
do, serve, suffice, do

WordNet sense 4 (reply or respond to):

WordNet sense 5 (understand the meaning of):
resolve, resolve

From the ODE community, based on WordNetadd/edit