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azúcar is a better example than mar because it's more vacillant. Everybody agrees that it's recursos del mar (3400 in Google) and I have now incorporated all vacillant-gender issues into the article. — “Talk:Spanish grammar/Archive 1 - Wikipedia, the free encyclopedia”, en.wikipedia.org
This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Vacillant nouns (called sustantivos ambiguos in Spanish) accept. — “Spanish nouns - Wikipedia, the free encyclopedia”, en.wikipedia.org