for british I need to type british man or british person, but american is ok and american man wrong
wut
āAmericanā can refer to both the nationality and a person of said nationality
āBritishā refers solely to the nationality, not to a person of said nationality
Or, in other words, you can call someone āan Americanā but you canāt call someone āa Britishā. Thatās why āBritishā is not accepted for ć¤ć®ćŖć¹äŗŗ. Iād say āAmerican personā and such should be accepted for ć¢ć”ćŖć«äŗŗ though.
āBritā or āBritonā is a person who is British.
I wonder if WaniKani accepts Britā¦
I do idly wonder if thereās dialectical differences, though. I have heard people refer to āa Chineseā or āa Japaneseā, though I never wouldā¦
Iāve heard those kinds of things too, but I donāt think Iāve ever heard it from native speakers. Iām not sure thoughā¦
Yes, you can use descriptors for groups as adjectival nouns - think also āthe poorā, āthe illā, āthe tallā, āthe disabledā, etc. but not āa poorā, āan illā and so on.
I donāt rightly know why that does work for groups but not individuals, other than it would make too much sense and therefore this absolute mess of a language doesnāt allow it. Though I guess in the case of individuals you just leave off the article - āheās tallā rather than āheās a tallā (unless you want to sound like Mario)
you got your answers there. i get caught with the same thing for french because iām too lazy to type french person.
add a synonym if it bugs you but the others are correct in saying british is not a noun. being lazy as i mentioned, i just type brit hehe. maybe i should enter frog as a synonym for french person. thatās much shorter 
note: i can make this bad joke cos iām kinda french
i would say only Brit since Briton refers to Great Briton again
I do that 100%, just because thatās how it works in french. Didnāt know it was wrong in englishā¦
You canāt say āa Britishā because British is an adjective, but not a proper noun. You can say a Briton or a Brit, which are the proper noun variations of British.
Btw, while probably not applicable to everything, nationalities that end in -i or -an (Brazilian, American, Italian, etc) can be used both as proper nouns and adjectives (A Brazilian, the Brazilian people, Brazilian pizza).
-ese, -ish, -ch terminations usually canāt be used as proper nouns (A Portuguese/British/French is incorrect).
Even when you can use it as a proper noun, though, it can and oftentimes does come off as very rude.
I think youāre mixing up Briton (a British person) and Britain (as in Great Britain)
Honestly seeing all this next to each other itās amazing anyone manages to learn English at all 
It really does seem needlessly confusing.
Yeah, I think the only case in which itās usually safe to do so is American, but itās all context-dependent of course. If youāre not sure, itās best to avoid referring to people by their nationality alone.
Thatād be āGreat Britainā. āBritonā with the O always refers to the people, never the island.
(āBretonā meanwhile, refers to the inhabitants of Brittany, which is in France.)
I wonder if WaniKani accepts Britā¦
It does! Thatās what I type every time.
To be fair, many Bretons were ancestrally Britons
Iāve heard it from native speakers, but almost exclusively older folks who chose to forego school to work on the farms in the rural state I grew up in, so not anyone I would be taking grammar lessons from.
While technically correct, āa Brazilianā conjures to mind something rather different than a Brazilian person. 
what did brazilians do to you guys to deserve thisā¦
Iām not positive, but I think that the procedure in question originated in Brazil, and Americans are notoriously lazy with language, so it got truncated down to āa Brazilian.ā
Of course, Iāve heard Canadians use the term, too, but Canada likes to borrow from America a lot, in general (and vice-versa). 
The elephant in the room is that the Japanese word for British effectively conflates England with Britain. Not sure what Scottish and Welsh learners of Japanese think of that.
How many people is a brazillion?
You just learned about American Exceptionalism