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.
snob - A person with an exaggerated respect for high social position or wealth who seeks to associate with social superiors and dislikes people or activities regarded as lower-class

Victor used to be friends with Pete, but once Victor suddenly became rich, he acted like a snob and refused to associate with Pete.