timidness vs shyness

timidness and shyness both are nouns.

Word	Noun	Adjective	Verb	Adverb
timidness	Yes	No	No	No
shyness	Yes	No	No	No

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

Other hyponyms of timidness include cold feet, diffidence, self-distrust, self-doubt.

timidness (noun)	shyness (noun)
fear of the unknown or unfamiliar or fear of making decisions	a feeling of fear of embarrassment