timidity vs diffidence

timidity and diffidence both are nouns.

Word	Noun	Adjective	Verb	Adverb
timidity	Yes	No	No	No
diffidence	Yes	No	No	No

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

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

timidity (noun)	diffidence (noun)
fearfulness in venturing into new and unknown places or activities	lack of self-confidence
fear of the unknown or unfamiliar or fear of making decisions