grandness vs loftiness

grandness and loftiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
grandness	Yes	No	No	No
loftiness	Yes	No	No	No

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

Other hyponyms of grandness include expansiveness, expansivity, majesty, stateliness, imperialness.

grandness (noun)	loftiness (noun)
the quality of being magnificent or splendid or grand	the quality of being high or lofty
unusual largeness in size or extent or number	impressiveness in scale or proportion
splendid or imposing in size or appearance
a prominent status