gallant vs impressive

gallant is a noun but impressive is not a noun.

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

gallant (noun)	impressive (noun)
a man who attends or escorts a woman
a man who is much concerned with his dress and appearance

gallant (adjective)	impressive (adjective)
unflinching in battle or action	making a strong or vivid impression
being attentive to women like an ideal knight	producing a strong effect
having or displaying great dignity or nobility
lively and spirited