ness = state or quality (ex. quietness, kindness.)
ment = action or result (ex. development, agreement)
sion = *same as ness* state or result (ex. depression, aggression)
able = capable of / fit for. (ex. available, affordable)
ish = relating to. (ex. childish, brownish)
ity = state or quality pa rin. (ex. complexity, equality)