in·stinct

– noun
1. an inborn pattern of activity or tendency to action common to a given biological species.
2. a natural or innate impulse, inclination, or tendency.
3. a natural aptitude or gift.
4. natural intuitive power.

in·nate

– adj.
1. existing in one from birth; inborn; native.
2. inherent in the essential character of something.
3. originating in or arising from the intellect or the constitution of the mind, rather than learned through experience.

ap·ti·tude

– noun
1. capability; ability; innate or acquired capacity for something; talent.
2. readiness or quickness in learning; intelligence.
3. the state or quality of being apt; special fitness.