How can you tell a noun's declension?

The declension for amicus is

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How can you tell amicus is in that declension?

• It means "boy"

• It ends in -us (nearly all words that belong in this declension end in those letters)

• It can be a singular subject

The declension for cena is the

 fabula

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How can you tell cena is in that declension?

• It can be in this declension or another depending on whether it is singular or not

• It's feminine and all words in this group are only feminine, no exceptions

• It ends in a letter -a and words have this letter when they are a nominative singular in this declension

What declension is spectator in?

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How can you tell spectator is in that declension?

• It ends with a unique nominative spelling and all nouns in this group have a unique nom spelling

• It means spectator and the same in English; all words that don't change their meaning are in this group

• All words in this group will end with the letters -or