grand vs impressive

grand is a noun but impressive is not a noun.

Word	Noun	Adjective	Verb	Adverb
grand	Yes	Yes	No	No
impressive	No	Yes	No	No

grand (noun)	impressive (noun)
a piano with the strings on a horizontal harp-shaped frame; usually supported by three legs
the cardinal number that is the product of 10 and 100

grand (adjective)	impressive (adjective)
used of a person's appearance or behavior; befitting an eminent person	making a strong or vivid impression
extraordinarily good or great; used especially as intensifiers	producing a strong effect
the most important and magnificent in adornment
of behavior that is impressive and ambitious in scale or scope
large and impressive in physical size or extent
of high moral or intellectual value; elevated in nature or style
of or befitting a lord
ostentatiously rich and superior in quality