alter (v)
change (v)
modify (v)

Definition: cause to change
Example: The advent of the automobile may have altered the growth pattern of the city. The discussion has changed my thinking about the issue.

alter (v)
change (v)
vary (v)

Definition: become different in some particular way, without permanently losing one's or its former characteristics or essence
Example: her mood changes in accordance with the weather. The supermarket's selection of vegetables varies according to the season.