Yesterday
Ayer = yesterday in Spanish.
aner is not a Spanish word. 'ayer' means 'yesterday'
Geographically, if you mean the "Ayer's Rock", it is in Australia. In terms of time, "ayer" is "yesterday" in Spanish.
Ayer is a spanish word. It means Yesterday in English. Or if used loosely it could just mean like sometime in the recent past. like 'the other day' but it literally translates to 'yesterday'.
Yesterday
I cannot find a Spanish word "ontem". "Onda" means "wave".
Ayer e.g. We went to the cinema yesterday. Fuimos al cine ayer.
"Ayer fue" means "yesterday was" in Spanish. It is commonly used to refer to events or actions that occurred the day before the current day.
That isn't Spanish. If you mean "ayer", that means "yesterday".
translated from Spanish it means 'goodbye yesterday'
Ayer fue martes*. (*in spanish, days and months are not capitalized)
yesterday