piquantness vs piquance

piquantness and piquance both are nouns.

Word	Noun	Adjective	Verb	Adverb
piquantness	Yes	No	No	No
piquance	Yes	No	No	No

As nouns, piquantness and piquance are synonyms defined as:

Other synonyms of piquantness include nip, piquancy, tang, tanginess, zest.

As nouns, piquantness and piquance are synonyms defined as:

piquantness and piquance: the quality of being agreeably stimulating or mentally exciting

Other synonyms of piquantness include piquancy.

piquantness (noun)	piquance (noun)
a tart spicy quality	a tart spicy quality
the quality of being agreeably stimulating or mentally exciting	the quality of being agreeably stimulating or mentally exciting