timidity vs cold feet

timidity and cold feet both are nouns.

Word	Noun	Adjective	Verb	Adverb
timidity	Yes	No	No	No
cold feet	Yes	No	No	No

As nouns, cold feet is a hyponym of timidity; that is, cold feet is a word with a more specific, narrower meaning than timidity:

Other hyponyms of timidity include shyness, diffidence, self-distrust, self-doubt.

timidity (noun)	cold feet (noun)
fearfulness in venturing into new and unknown places or activities	timidity that prevents the continuation of a course of action
fear of the unknown or unfamiliar or fear of making decisions