shivering vs trembling

shivering and trembling both are nouns.

Word	Noun	Adjective	Verb	Adverb
shivering	Yes	Yes	No	No
trembling	Yes	Yes	No	No

As adjectives, shivering and trembling are synonyms defined as:

shivering and trembling: vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze

Other synonyms of shivering include shaky.

shivering (noun)	trembling (noun)
a sensation of cold that often marks the start of an infection and the development of a fever	a shaky motion

shivering (adjective)	trembling (adjective)
vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze	vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze