brainstorming vs brainstorm

brainstorming and brainstorm both are nouns.

Word	Noun	Adjective	Verb	Adverb
brainstorming	Yes	No	No	No
brainstorm	Yes	No	Yes	No

brainstorming (noun)	brainstorm (noun)
a group problem-solving technique in which members spontaneously share ideas and solutions	the clear (and often sudden) understanding of a complex situation

brainstorming (verb)	brainstorm (verb)
	try to solve a problem by thinking intensely about it