即日(そくじつ)

the same day; immediate

即時(そくじ)

immediate; instant

即決(そっけつ)

prompt decision; deciding on the spot

即答(そくとう)

immediate answer

即(すなわ)ち

namely; in other words

即席(そくせき)

instant; improvised

即座(そくざ)

immediately; on the spot

即興(そっきょう)

improvisation; impromptu

即死(

その質問(しつもん)には即答(そくとう)できません。

I can't answer that question immediately.

即日発送(そくじつはっそう)できます。

It can be shipped the same day.