为了深入地研究这个问题，我对比了 COCA 词频表和朗文核心词汇分级词表，发现 COCA 非常不靠谱。为了方便，我合并了这两个表，如下图。其中 coca 一列是单词的coca词频从高到低顺序排名， longman_level 一列是朗文认定的核心词重要性排名，只分3个大的等级，每3000词一级，数值3指它在最核心的 3000 词之内，数值2值6000之内，数值1指9000之内。现在举两个例子， kitten, band， 这都是必须会的词，在朗文词典中排在前3000的重要词表中，而 COCA 则排在了10000开外，朗文的列表更靠谱!

下面给一个简表，在朗文核心 3000 词汇中收录，但在 coca 60000 中都不收录的词。

A <———– not found

according to <———– not found

all right <———– not found

an <———– not found

anytime <———– not found

April <———– not found

behaviour <———– not found

bin <———– not found

café <———– not found

cannot <———– not found

can’t <———– not found

car park <———– not found

cent <———– not found

centimetre <———– not found

centre <———– not found

Christmas <———– not found

colour <———– not found

congratulation <———– not found

credit card <———– not found

December <———– not found

dining room <———– not found

dollar <———– not found

Dr <———– not found

DVD <———– not found

each other <———– not found

email <———– not found

etc. <———– not found

February <———– not found

first name <———– not found

flavour <———– not found

Friday <———– not found

gallon <———– not found

good afternoon <———– not found

good evening <———– not found

good morning <———– not found

good night <———– not found

gram <———– not found

Halloween <———– not found

Hello! <———– not found

high school <———– not found

I <———– not found

ice cream <———– not found

Independent, the <———– not found

Internet <———– not found

January <———– not found

July <———– not found

June <———– not found

kilo <———– not found

kilogram <———– not found

kilometre <———– not found

last name <———– not found

latest <———– not found

let’s <———– not found

litre <———– not found

living room <———– not found

metre <———– not found

mile <———– not found

mobile phone <———– not found

Monday <———– not found

movie theater <———– not found

Mr <———– not found

Mrs <———– not found

ms <———– not found

neighbour <———– not found

next door <———– not found

next to <———– not found

no one <———– not found

November <———– not found

October <———– not found

of course <———– not found

OK <———– not found

ought to <———– not found

ounce <———– not found

pants <———– not found

parking lot <———– not found

penny <———– not found

percent <———– not found

p.m. <———– not found

police officer <———– not found

post office <———– not found

President <———– not found

programme <———– not found

railway station <———– not found

rosé <———– not found

Saturday <———– not found

September <———– not found

shopping centre <———– not found

Sunday <———– not found

Sun, The <———– not found

Sweep <———– not found

swimming costume <———– not found

swimming pool <———– not found

swimming trunks <———– not found

thank you <———– not found

theatre <———– not found

Thursday <———– not found

traffic lights <———– not found

T-shirt <———– not found

Tuesday <———– not found

TV <———– not found

tyre <———– not found

used to <———– not found

washing machine <———– not found

Wave <———– not found

Wednesday <———– not found