You lose all the formatting and the line breaks when you make comments. I talki should fix this

From Google dictionary: Interestingly, when you look up "shiver," "tremble" is given as a synonym, but not vice versa. shiv·er verb 1. (of a person or animal) shake slightly and uncontrollably as a result of being cold, frightened, or excited. "they shivered in the damp foggy cold" synonyms: tremble, quiver, shake, shudder, quaver, quake noun: shiver; plural noun: shivers 1. a momentary trembling movement. "she gave a little shiver as the wind flicked at her bare arms" trem·ble ˈ verb 1. shake involuntarily, typically as a result of anxiety, excitement, or frailty. "Isobel was trembling with excitement" synonyms: shake, shake like a leaf, quiver, twitch, jerk; 2. be in a state of extreme apprehension. "I tremble to think that we could ever return to conditions like these" synonyms: be afraid, be frightened, be apprehensive, worry, shake in one's boots; More (of a person's voice) sound unsteady or hesitant. 3. shake or quiver slightly. "the earth trembled beneath their feet" synonyms: shake, shudder, quake, wobble, rock, vibrate, move, sway, totter, teeter; noun noun: tremble; plural noun: trembles; plural noun: the trembles 1. a trembling feeling, movement, or sound. "there was a slight tremble in his voice" synonyms: tremor, shake, shakiness, trembling, quiver, quaking, twitch, vibration, unsteadiness More antonyms: steadiness 2. informal a physical or emotional condition marked by trembling.

They are very similar, but when talking about people, shiver is often associated with shaking from being cold and tremble is often associated with shaking out of fear.

Both same meaning..