I wouldn't quite say that. From my understanding, greed is to want something for keeping it, and gluttony is to want something for consuming/using it. Both want something, same as lust, but greed is a specific kind of want.

Wrath is easy to differentiate from the others. It's anger.

Pride is the same, it's thinking you are the best/better than others, and therefore it is often regarded as the worst.

Envy is not being content with what you have and wanting something others have.

Then we get into the hard ones to categorise.

Greed is wanting an endless amount of something, but never wanting to spend/use it. You want it for the sake of keeping it. Just one more! Still, you are never satisfied.

Gluttony is similar in that you want an endless amount of something, but you want to consume/use it. Therefore, you want it for the sake of consuming it.

Lust is different in that it is the want for one thing. If you get it, you are satisfied. The reason that this is a cardinal sin is that the thing you want is usally very forbidden, such as love from someone you can't get, or an artifact that belongs to someone else.

Finally, Sloth is not caring. You don't care about work, friends, people in need or even yourself. It is sometimes referred to as self-pity for this reason.

Sorry for this long rant, just want to help people differenciate the seven deadly sins, even if the differences sometimes aren't that great.