The noun has one meaning:
Meaning #1:
a shaky motion
Synonyms: shaking, shakiness, quiver, quivering, vibration, palpitation
The adjective trembling has one meaning:
Meaning #1:
vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze
Synonyms: quaking, quivering, shaking, shaky, shivering



