invention

contraption, device, gadget, gizmo (also gismo), novelty

design, product, work

dream, fantasy (also phantasy), picture, vision

conception, imagining, origination

anecdote, narrative, novel, story, tale, yarn

fairy tale, falsehood, falsity, fib, lie, mendacity, misrepresentation, prevarication, untruth, whopper

make-believe

brainstorm, brainstorming, inspiration

fecundity, fertility

ingenuity, resourcefulness

versatility

chimera, daydream, delusion, dream, figment, hallucination, illusion, mind's eye, mirage, phantasm (also fantasm), pipe dream

envisaging, visualization

fecundity, fertility, fruitfulness, productiveness, productivity, prolificacy, prolificity, prolificness

capableness, resourcefulness

genius, giftedness, talent

fire, inspiration, muse