an organic chemical substance formed in plants and animals, able to cause chemical changes without being changed itself

something which incites activity

of goose

ambition, inspiration

to encourage, urge a person, especially to do wrong

stimulus

a kind of waterbird larger than a duck

ambition, inspiration

the force with which a body moves

stimulus, force

a sudden desire to act without thought about the consequences; a short increase in strength, force

drive, resolve

motive

motive

one of a pair of sharp-toothed wheels on the heels of a rider's boots, used to make the horse go faster

incitement, stimulus

a drink (e.g. coffee, brandy), drug etc that increases bodily or mental activity; anything that encourages a person (e.g. praise, hope of gain)

substance that invigorates

something that encourages (a person to do something, an activity etc); something, e.g. light, heat, electricity that causes an animal or plant to do something

provocation