tremble vs unconditioned reflex

tremble and unconditioned reflex both are nouns.

Word	Noun	Adjective	Verb	Adverb
tremble	Yes	No	Yes	No
unconditioned reflex	Yes	No	No	No

As nouns, unconditioned reflex is a hypernym of tremble; that is, unconditioned reflex is a word with a broader meaning than tremble:

tremble: a reflex motion caused by cold or fear or excitement
unconditioned reflex: an automatic instinctive unlearned reaction to a stimulus

tremble (noun)	unconditioned reflex (noun)
a reflex motion caused by cold or fear or excitement	an automatic instinctive unlearned reaction to a stimulus

tremble (verb)	unconditioned reflex (verb)
move or jerk quickly and involuntarily up and down or sideways