Not sure if it's an accepted technical term, but if I saw vocabulary and repertoire in the same sentence, I'd assume vocabulary is those words & meanings someone is capable of understanding, where repertoire means only those the person actually uses.

If OP will accept a two-word term, the most suitable is probably active vocabulary (as opposed to passive, being words understood but not used).

There is also productive vocabulary (normally contrasted with receptive), but I don't like that because "productive" in linguistics usually applies to a word or term to means it's often used to make new words or terms, or has its meaning easily stretched into to new areas.

This NGram shows active vocabulary is consistently used more than productive vocabulary.

Not a standard technical distinction, but if I saw vocabulary and repertoire in the same sentence, I'd assume vocabulary is those words & meanings someone is capable of understanding, where repertoire means only those the person actually uses.

If OP will accept a two-word term, the most suitable is probably active vocabulary (as opposed to passive, being words understood but not used).

There is also productive vocabulary (normally contrasted with receptive), but I don't like that because "productive" in linguistics usually applies to a word or term to means it's often used to make new words or terms, or has its meaning easily stretched into to new areas.

This NGram shows active vocabulary is consistently used more than productive vocabulary.

Not sure if it's an accepted technical term, but if I saw vocabulary and repertoire in the same sentence, I'd assume vocabulary is those words & meanings someone is capable of understanding, where repertoire means only those the person actually uses.

Not sure if it's an accepted technical term, but if I saw vocabulary and repertoire in the same sentence, I'd assume vocabulary is those words & meanings someone is capable of understanding, where repertoire means only those the person actually uses.

If OP will accept a two-word term, the most suitable is probably active vocabulary (as opposed to passive, being words understood but not used).

There is also productive vocabulary (normally contrasted with receptive), but I don't like that because "productive" in linguistics usually applies to a word or term to means it's often used to make new words or terms, or has its meaning easily stretched into to new areas.

This NGram shows active vocabulary is consistently used more than productive vocabulary.