Diferença De Other E Another
Why this trips people up
Most textbooks explain it with countable and uncountable nouns, but that's the wrong starting point. It actually comes down to whether you're talking about one single extra thing or multiple remaining things. I've seen people struggle with this for years and the issue is usually not knowing which frame to use.
The simplest way to think about it: another = one more, other = the rest.
The real diferença de other e another
Another is used when you mean one additional item of the same type. It takes a singular noun. "I'd like another coffee." That's it. One more cup. You don't need to specify which one because it's just one more of whatever you already have. Other is different. It's the general word for the remaining items in a group. It can be singular or plural depending on the noun. "Where are the other books?" Plural. "Have you seen the other hand?" Singular, but referring to the one remaining counterpart, not one more of the same kind.
I ran into a real problem once when editing technical documentation. The original author wrote "give me the another option" when they meant the second available choice in a pair. It wasn't about adding a new option to the list, it was about the alternative. Changing it to "the other option" fixed it immediately. That's the kind of mistake that looks fine to most learners until someone actually uses it in context.When to use which
If you can replace it with "one more," use another. If you can replace it with "the rest of" or "the remaining," use other. Here's how that plays out in practice: Another day. One more day. Another cookie. One more cookie. Another candidate. One more person on the shortlist.
The other day. The remaining day (in a known pair). The other candidates. The remaining people on the list. The other side. The opposite side.

Common mistakes that cost points
Native speakers don't mark this heavily, but in any professional writing situation, mixing them up stands out. Here are the ones I see most often: "I need other pen" — wrong. Should be "another pen" or "the other pen" depending on context. "Other" without "the" before a singular countable noun is almost never correct. "Give me the another book" — also wrong. You can't stack "the" and "another" together. They're mutually exclusive determiners. Pick one or the other.
"The other people are waiting" vs "Another people are waiting" — the first implies the specific remaining people you know about. The second would mean some unspecified additional people, which sounds odd with "people" since it's plural. You'd more naturally say "some other people" in that case.
A few edge cases worth knowing
There's a usage where "other" appears without "the" before plural nouns, and it's perfectly grammatical: "Some other ideas came to me later." This is different from "another" because you're talking about multiple items, not one additional item. There's also the phrase "other than," which means "except." "I don't eat anything other than vegetables." This has nothing to do with quantity and more to do with exclusion. Don't try to force another into this pattern. When you say "others" by itself, it's a pronoun replacing a plural noun: "Some stayed, others left." It's shorthand. You can't say "an others" because "others" is already plural and "an" is singular.

Quick reference
Another + singular countable noun (one more) The other + singular noun (the second of two) Other + plural noun (the remaining ones, with "the")
Others (standalone pronoun, plural) Other + plural noun without "the" (some additional, indefinite)
Practical test for the diferença de other e another Next time you're unsure, try the replacement trick. Read your sentence and swap in "one more" wherever you're considering another. If it makes sense, you've got the right choice. If it doesn't, check whether you're talking about the remaining items in a known set and reach for other instead.
Galeria
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Diferença Entre Other E Another - FDPLEARN -
Other X Others X Another: Qual É A Diferença? – ADETVC -
Other X Others X Another: Qual É A Diferença? – Estrich Mobil