Bubble
Foam
independent noun, in compounds
The kanji and the word are exactly the same. That means they share meanings as well.
It's a bubble!
A Wha---? (あわ)
A BUBBLE.
A WHA???
泡が出る
foam comes out
泡が消える
the bubbles disappear
泡が立つ
to bubble, to foam
泡石けん
foamy soap
泡状
foamy, frothy
泡立ち
lathering, foaming
泡を飛ばす
to blow bubbles
泡を立てる
to create a lather
泡を吹く
to foam at the mouth
ビールの泡
head on beer
石けんの泡
soap bubbles
洗剤の泡
detergent foam
マリファナを一服した瞬間、男は口から泡を吹いて地面に倒れ込んだ。
The moment he took a puff of marijuana, he fell to the ground foaming at the mouth.