luffa vs loofa

luffa and loofa both are nouns.

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

As nouns, luffa and loofa are synonyms defined as:

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

Other synonyms of luffa include loofah, loufah sponge.

luffa (noun)	loofa (noun)
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
the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer