the plural form of vocabulary

[HamburgEnglish]

Uncountable nouns (whether default singular or plural) are in fact singular in grammatical form, BUT not always in meaning. This is where many people get really confused.

Vocabulary is PLURAL in meaning and as an uncountable noun SINGULAR in grammar form.

Look up - "Vocable" - In speech, a vocable is an utterance, term, or word that is capable of being spoken and recognized. A non-lexical vocable is used without semantic role or ...

[Torsten]

So what exactly is 'incorrect', Rob? I wrote that grammatically 'vocabulary' is singular. Why would that be incorrect?

TOEIC listening, photographs: A sun set on the beach

[Haihao]

And please take a look at a dictionary's definition:

[HamburgEnglish]

eh?