Earlier quoted context omitted.
Can I ask respectfully what you mean by fluent? Only because...the textbook definition and the colloquial definition differ. I think generally when people say 'fluent' they mean 'native speaker level at reading, writing and speaking language X', whereas fluent actually means you can speak without hesitation on a range of topics. Just a clarification, not an attack! Edit: Plus, I wouldn't knock wordlists. I started tr…
I also have a problem with the word "fluent". Ok you say you're fluent, here's a simple self-check: Explain to someone in the language you claim to be fluent in how you'd go about making a fire without any matches. (hint: you need to use words like tinder, kindling, flint, etc.). If you can't do this, or grapple with the fact that you don't have a repertoire of these words in your vocabulary, you might want to recons…
I am native speaker/reader/writer fluent in my 2nd language, and I don't know the word for kindling. I am reasonably certain there is one, but would have to look it up, and so would any other native speaker that wasn't a linguist.
In fact, if I did happen to know the word and used it, no native speaker would understand me without an explanation.
The way I (and practically any other native speaker) would describe that portion of the task would be to say something like "use a small amount of paper, twigs, sawdust, dry leaves, or any other easily ignited material as a starter".
I used to get very frustrated at all the English words that didn't have direct equivalents, such that I found the 2nd language rather limiting in it's expressiveness.
In fact, I am pretty sure that the way most native speakers would approach the 'explain how to make fire' task would to say "here, let me show you how to do it."
Example: there exist equivalents to the words shiny, glittery, sparkly and most other common variations on the concept (some translate to the same word), but if you want to express 'pearlescent', the best you could do is 'lustrous like a pearl'.
Worse yet, often if I did find an obscure equivalent word and used it no one else would recognize it, and even if they figure it out from context they would still think I was weird or trying to score points with my vocabulary.
Further, in the 20 years since I actually lived there, using English loan words has become rampant, so much so that by not using them my speech comes across as rather affected, stuffy, and snobbish (eg. the word for upgrade (noun or verb) is for all intents and purposes 'upgrade', even though a perfectly understandable equivalent does actually exist).