Is it fungible?

I woke up and remembered that there’s a word, “fungible,” but not what it meant. Then my brain played a Letterman style game with itself that couldn’t be won called, “Is it Fungible?” It was like:

Apricot preserves: is it fungible?
I don’t know, I don’t remember what fungible means.

Lithium batteries: is it fungible?
I don’t know, I don’t remember what fungible means.

Fungus: is it fungible?
I don’t know, I don’t remember what fungible means.

Tax-deferred variable annuity: is it fungible?
I don’t know, I don’t remember what fungible means. I also don’t know what a tax-deferred variable annuity is.

etc…