lettuce vs sugar

lettuce and sugar both are nouns.

Word	Noun	Adjective	Verb	Adverb
lettuce	Yes	No	No	No
sugar	Yes	No	Yes	No

As nouns, lettuce and sugar are synonyms defined as:

lettuce (noun)	sugar (noun)
leaves of any of various plants of Lactuca sativa	a white crystalline carbohydrate used as a sweetener and preservative
any of various plants of the genus Lactuca	informal terms for money
informal terms for money	an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain

lettuce (verb)	sugar (verb)
	sweeten with sugar