Synonyms for Agreement (same or very similar meaning)
WordNet sense 1 (harmony of people's opinions or actions or characters):
accord
WordNet sense 2 (the determination of grammatical inflection on the basis of word relations):
concord
WordNet sense 3 (the statement (oral or written) of an exchange of promises):
understanding
WordNet sense 4 (the thing arranged or agreed to):
arrangement
WordNet sense 5 (compatibility of observations):
correspondence
From the ODE community, based on WordNet
add/edit