tremor - A slight shaking movement, such as one caused by an earthquake or instability; also a subtle or faint sign of emotion, such as fear or excitement in the voice or body.
Because he was nervous, his voice had a significant tremor during the presentation.
thrust - A sudden or violent lunge with a pointed weapon or a bodily part
In the wrestling competition, Jerry's opponent had him pinned down, but with a strong thrust of his arms, Jerry pushed this opponent off of him, and then had his opponent pinned down instead.