Synonyms for Brainstorm:

n.

buffoonery, crank, tomfoolery, frivolity, thoughts, antics, shenanigans, aberration, stunt. commitment, ideal, philosophy, faith, belief. commentary, exploration, inquest, negotiation, discussion, argument, talks, debate, exchange, consultation. canvass, consult, argue, talk through, talk, negotiate, discuss, clear the air. brainstorm (noun)
insight, brainwave.
cognition (noun)
insight, brainwave.
idea (noun)
ideation, image, inspiration, inkling, thought, consideration, notion, principle, opinion, conception, reflection, plan, design, concept, supposition, observation, theory, idea, vision, perception.

v.

imagine (verb)
contemplate, imagine, consider, reflect, think, suppose, conceive, envision, fantasize, invent, observe, ideate, create, perceive, opine, theorize.
problem-solve (verb)
create, plan, think, invent, conceive.

Other synonyms:

frivolity, crank, tomfoolery, stunt, antics, shenanigans. aberration. create
conceive.
suppose
opine.
Other relevant words:
consult, crank, insight, frivolity, stunt, antics, shenanigans, brainwave, ideal.

Usage examples for brainstorm

  1. " That's really a brainstorm Clee," Belle sneered. – The Galaxy Primes by Edward Elmer Smith