Motivator

n.energetic, hopefulprofessional

What it means

A person or factor that gives someone a reason or desire to act.

Reach for it when identifying a source of motivation without assuming it works for everyone

Visible improvement became a stronger motivator than the promised prize.

playful
cheerleader
when enthusiastic personal support is the main contribution
not when The term can trivialize substantive help and carries gendered stereotypes.
everyday
reason to act
when plain explanation is more useful than a role label
not when The phrase may identify logic without emotional drive.
warm
encourager
when a person strengthens confidence through support
not when The uncommon noun sounds awkward and encouragement may not motivate action.
warm
inspiration
when a person or example awakens aspiration
not when Inspiration can remain emotional without creating sustained action.
professional
catalyst
when a factor triggers or accelerates change
not when A catalyst starts movement but may not provide ongoing motivation.
professional
coach
when a person supports performance through feedback and practice
not when A coach has a defined developmental role and is not merely a motivator.
professional
incentive
when an external reward or consequence prompts action
not when Incentive describes a mechanism, not a supportive person, and may distort behavior.
formal
driving force
when one factor supplies strong continuing energy
not when The phrase can overstate one cause in a complex decision.
formal
spur
when pressure or stimulus prompts quicker action
not when Spur can imply discomfort or coercion rather than willing engagement.

strong motivator
Mastering one useful task was a strong motivator for the class.
key motivator
Control over scheduling was the key motivator in the survey.
powerful motivator
Belonging can be a powerful motivator without being the only one.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.