loofa vs luffa

loofa and luffa both are nouns.

Word	Noun	Adjective	Verb	Adverb
loofa	Yes	No	No	No
luffa	Yes	No	No	No

As nouns, loofa and luffa are synonyms defined as:

loofa and luffa: the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer

Other synonyms of loofa include loofah, loufah sponge.

loofa (noun)	luffa (noun)
the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer	any of several tropical annual climbers having large yellow flowers and edible young fruits; grown commercially for the mature fruit's dried fibrous interior that is used as a sponge
	the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer