Noun Vicino incorrectly listed in adjective vicino in vocabulary.
In the Italian vocabulary section, vicino (neighbor) is one of of the listings in vicino (near), even though other forms of neighbor have their own entry.
Additionally, not all forms of vicino(near) have definitions supplied.
This is happens everywhere in the vocab section. For example in http://www.duolingo.com/word/it/aprire/Verb
The example "open Le finestre sono aperte. The windows are open." is given. Here aperte is the plural feminine form of apperto and should be listed under: http://www.duolingo.com/word/it/aperto/Adjective, but the only form under aperto is the singular feminine. All the others show up under the verb aprire.