Someone is tremulous when they are shaking slightly from nervousness or fear; they may also simply be afraid of something.
Something tremendous is very big, really strong, amazing, or excellent.
move or jerk quickly and involuntarily up and down or sideways
(music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones
shake with seismic vibrations
Differentiated vocabulary for your students is just a click away.