Single word for "personal vocabulary"

I find that I have a sort of "personal dictionary" of words that I like to use. I use "salient" a lot. I use "hence", "perhaps", "incapable", "fortuitous" frequently. I store a sort of "cache" of words - both common and uncommon - that I use regularly as a part of how I speak.

I figure this is the case for everybody - certain friends use some words more than others in regular communication, etc. I'm sure you have your own set of words that you tend to "fall back" on.

So the question is - what is the name for this cache? What is the word or phrase for "collection of words or phrases a person commonly uses to communicate"?

This might be referred to as your idiolect.

the speech habits peculiar to a particular person:
in his strange idiolect, he preferred to call angels ‘angelicals’

[ODO]

However, what this does not refer to is a habit of using a particular word a lot. That probably is just a habit.

You can also try lexicon.

Noun The vocabulary of a person, language, or branch of knowledge. A dictionary, esp. of Greek, Hebrew, Syriac, or Arabic: "a Greek–Latin lexicon". Synonyms dictionary - vocabulary - wordbook - thesaurus - glossary