Synonyms for Motivation:

n.

fascination, passion, love affair, involvement, absorption, interest, spice, fixation, public interest. excuse, in justification of something, pretext, inspiration, point, occasion. fillip, spur, Stimulator, stimulant, cause. ground, reason, start, spring. aid (noun)
assistance, encouragement, help, endowment, support, avail, Mothering, service, benefit, sustenance, ministration, attendant, aid, facilitation, relief, agency.
ambition, inspiration (noun)
impetus, provocation, inducement, reason, push, encouragement, spur, impulse, motive, incentive, stimulus, incitement, drive, instigation, interest.
compulsion (noun)
compulsion, propulsion, obligation, intimidation, coercion, incitement, stimulation, duress, urge.
impulse (noun)
jog, sling, jolt, knock, jerk, momentum, pitch, shove, bump, prod, push, poke, shot, nudge, thrust, punch, strike, impulse.
influence (noun)
command, mastery, pressure, power, seniority, importance, sway, rule, influence, supremacy, pull, control, bias, predominance, rank, authority.
motivation (noun)
need, inducement, drive, lure, energy, instigation, stimulus, motivating, impetus, motive, incentive, provocation.
tops (noun)
need, motive.

Other synonyms:

fixation, involvement, passion, love affair, pretext, Stimulator, fascination, public interest. interest, occasion, stimulant, spur, inspiration. absorption, excuse, reason, fillip. ground. cause. point. Other relevant words:
fixation, interest, spur, motive, Stimulator, fillip, stimulant, occasion, inspiration, point, cause, spring, passion, motivating, reason, ground, need.