勢力【せいりょく】
influence, power, might, strength, potency, force, energy
姿勢【しせい】
posture, pose, position, stance, carriage (of the body), attitude, approach, stance
情勢【じょうせい】
state of things, state of affairs, situation, conditions, circumstances
勢い【いきおい】
force, vigor, vigour, energy, spirit, life, influence, authority, power, might, impetus, momentum, course (of events), naturally, necessarily
態勢【たいせい】
attitude, posture, preparedness, readiness
大勢【おおぜい】
crowd of people, great number of people, in great numbers
攻勢【こうせい】
offensive (movement), aggression
優勢【ゆうせい】
superiority, superior power, predominance, preponderance
劣勢【れっせい】
inferiority (e.g. numerical), inferior position, disadvantage, unfavorable situation, unfavourable situation
威勢【いせい】
power, might, authority, influence, spirits, vigor, vigour, energy, boldness
国勢【こくせい】
state of a country (population, resources, etc.), condition of a country, strength of a country