impressiveness vs excellence

impressiveness and excellence both are nouns.

Word	Noun	Adjective	Verb	Adverb
impressiveness	Yes	No	No	No
excellence	Yes	No	No	No

As nouns, excellence is a hypernym of impressiveness; that is, excellence is a word with a broader meaning than impressiveness:

impressiveness: splendid or imposing in size or appearance
excellence: the quality of excelling; possessing good qualities in high degree

impressiveness (noun)	excellence (noun)
splendid or imposing in size or appearance	the quality of excelling; possessing good qualities in high degree
the quality of making a strong or vivid impression on the mind	an outstanding feature; something in which something or someone excels