vaulting vs overreaching

vaulting is a noun but overreaching is not a noun.

Word	Noun	Adjective	Verb	Adverb
vaulting	Yes	Yes	No	No
overreaching	No	Yes	No	No

As adjectives, vaulting and overreaching are synonyms defined as:

vaulting and overreaching: revealing excessive self-confidence; reaching for the heights

vaulting (noun)	overreaching (noun)
a light leap by a horse in which both hind legs leave the ground before the forelegs come down
(architecture) a vaulted structure

vaulting (adjective)	overreaching (adjective)
revealing excessive self-confidence; reaching for the heights	revealing excessive self-confidence; reaching for the heights