viola vs pansy

viola and pansy both are nouns.

Word	Noun	Adjective	Verb	Adverb
viola	Yes	No	No	No
pansy	Yes	No	No	No

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

viola: any of the numerous plants of the genus Viola
pansy: large-flowered garden plant derived chiefly from the wild pansy of Europe and having velvety petals of various colors

viola (noun)	pansy (noun)
any of the numerous plants of the genus Viola	offensive term for a homosexual man
a bowed stringed instrument slightly larger than a violin, tuned a fifth lower	a timid man or boy considered childish or unassertive
	large-flowered garden plant derived chiefly from the wild pansy of Europe and having velvety petals of various colors