What is the difference between a money mutual account, a brokerage account, a taxable account, and a mutual fund account?
Well, good job with what you're doing so far. It sounds like you have a plan to continue paying down your debt and keep investing more money in the market.
As for the accounts you asked about:
Investopedia and Bogleheads wiki are great places to 'google' certain terms you are unfamiliar with. A quick search of investopedia returns this blurb about Money Mutual funds (edited by me a little for simplicity):
"With a money market fund, you can still write checks and transfer money into your checking account when you need it, but it is no longer a savings account - it is an investment.
The returns are better, the risk/security is comparable, and taxes and access are easily handled...you will find that a money market account will help you to see some returns from the money you are keeping as an emergency fund or just waiting to invest."
Basically, this would be a fine place to put your emergency fund.
A Brokerage account as commonly referred to in the personal finance world (like MMM forums, Bogleheads, etc.) is often synonymous with a "Taxable account". As opposed to your Traditional 401k or a Traditional IRA, Brokerage/Taxable accounts hold money that has been taxed already and you are choosing to invest it. Additionally, interest, gains and distributions from investments held in a Taxable/Brokerage account will be taxable.
Traditional 401ks and Traditional IRAs are 'pre-tax'.
"Taxable/Brokerage" accounts are 'after-tax' money (for a simplistic and not quite precise example...you're employer already withheld the federal and state taxes from your paycheck, because you didn't tell them to put it in a Traditional 401k first. Now you only have the leftover money
after it has been taxed to put into a Taxable/Brokerage account).
A mutual fund is not an account but rather a
type of investment.
Mutual funds can be
held in any of the above
accounts mentioned so far... A Money Market Mutual account is likely holding a type of mutual fund, a Traditional 401k, taxable/brokerage account, etc. can all hold mutual funds. I've handed you a few fish..At this point I would suggest you perhaps search investopedia/bogleheads wiki for explanations of what a mutual fund is..
Also, check out blog posts at JLCollins Stock Series to keep furthering your learning if you haven't read those already
http://jlcollinsnh.com/stock-series/ Hope that helps some!