girasol vs sunflower

girasol and sunflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
girasol	Yes	No	No	No
sunflower	Yes	No	No	No

As nouns, sunflower is a hypernym of girasol; that is, sunflower is a word with a broader meaning than girasol:

girasol: tall perennial with hairy stems and leaves; widely cultivated for its large irregular edible tubers
sunflower: any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays

Other hypernyms of girasol include helianthus.

girasol (noun)	sunflower (noun)
tall perennial with hairy stems and leaves; widely cultivated for its large irregular edible tubers	any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays
an opal with flaming orange and yellow and red colors