tremble vs instinctive reflex

tremble and instinctive reflex both are nouns.

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

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

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

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

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