al·ter

– verb
1. to make different in some particular, as size, style, course, or the like; modify.
2. to change; become different or modified.

al·tar

– noun
1. an elevated place or structure, as a mound or platform, at which religious rites are performed or on which sacrifices are offered to gods, ancestors, etc.
2. the constellation Ara.

A·ra

– noun
1. a southern constellation between Triangulum Australe and Scorpius.
2. "The Altar."