ガム

がむ
noun
chewing gum
1. chewing gum
A sweet, flavored substance for chewing.
ガムを噛(か)む。
I chew gum.
I like mint-flavored gum.
I spit out the gum.

ガム (from English "gum") refers specifically to chewing gum. The full form チューインガム exists but is rarely used in everyday speech.

Common expressions

WATCH OUT (ガムテープ):
ガムテープ means packing tape, not anything to do with chewing gum: the name comes from gummed paper tape, and it now covers cloth and plastic packing tape too.

Watch out

ゴム means rubber — a completely different word despite the similar sound. Do not confuse ガム (gum) with ゴム (rubber).