[KyleGoetz]

I have a couple more vocabulary questions that have popped up over the past few days of kanji/vocab studies:

How are 税関 and 関税 different? Both are some variation on "customs" like the thing you go through when importing products into your country, right?

Both 即座に and 即時に mean "immediately," but is there any time difference between them?

I know I am nitpicking stuff, but this type of thing is what reinforces the meanings of the words for me, rather than just accepting that I know it means "immediately" and skipping to the next flashcard.