I just submitted a fix for the "candidate" misspelling. You can fix these issues yourself and request that your changes be merged into the site, if you like.
Define native English speaker?
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My working definition of a native English speaker is someone who speaks English exclusively.
To put it another way, it's a person who thinks exclusively in English. This person for example might have a large vocabulary, and know a few different words which mean the same thing, but in order to capture different feelings or frames they choose different words according to for example how the word looks to the eye or sounds to the ear when read out loud.
Homonyms I would think would be really confusing for non-native English speakers. Also the word associations are different even between different groups of native English speakers but there are common word associations in certain communities.
So usually "Limitless" is used in favor of Unlimited even though both expressions would be grammatically correct. Limitless being more commonly expressed as "Limitless possibilities" is just the more popular way of saying it and so it doesn't stand out as much. If the goal is to make the expression stand out then Unlimited does stand out but it's associated with "Unlimited data plan" for example to most people in the United States.
Unlimited data plans may not exist everywhere so those associations don't exist elsewhere, so the connotations are the same.
I apologize for all of this. I'm a nitpicking perfectionist at times which is why it's probably best to ignore my subjective cosmetic suggestions. Spellchecking is objective.