Altar is the table in a ceremony. Alter means to change. Stood at the altar. Alter the schedule. Diction as a set is in word choice.
Noun versus verb
If you can put the in front and mean furniture, it is altar. If someone is revising a plan, a dress, or a sentence, it is alter.
Altogether versus all together is another look-alike, in altogether versus all together. Affect versus effect is in affect versus effect. Grammar overall is in ACT grammar rules.
The bottom line
Ceremony table: altar. Change: alter.
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