Learn Icelandic: Önnur hönnun er líka valkostur. - Another design is also an option.

Önnur is the feminine nominative singular form of annar (another/other). It has to change its shape to match the gender and case of the noun it describes, which is the feminine subject hönnun (design).

How do I know if Önnur means "another" or "other"?

Icelandic uses the same word for both "another" and "other". You have to rely on the context to choose the best English translation. In this sentence, "Another design" sounds the most natural, but it could also mean "A different design".

Hönnun doesn't look like a typical feminine word. How can I tell its gender?

While many feminine words end in a vowel, almost all Icelandic nouns that end in -un are feminine. These words often describe an action or a process, like hönnun (design) or verslun (shopping/store).

Why is valkostur in the nominative case here rather than the accusative?

The verb er (is) works like an equals sign rather than an action verb. It links the subject (Önnur hönnun) to what it is (valkostur). Because of this, the word on the receiving end stays in the nominative case instead of changing to the accusative.