Synonyms for Vary (same or very similar meaning)
WordNet sense 1 (be at variance with; be out of line with):
depart, deviate, diverge, deviate
WordNet sense 2 (make something more diverse and varied):
motley, variegate
WordNet sense 3 (make or become different in some particular way, without permanently losing one's or its former characteristics or essence):
alter, change
From the ODE community, based on WordNet
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