sugar vs lettuce

sugar and lettuce both are nouns.

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

As nouns, sugar and lettuce are synonyms defined as:

sugar (noun)	lettuce (noun)
a white crystalline carbohydrate used as a sweetener and preservative	leaves of any of various plants of Lactuca sativa
informal terms for money	any of various plants of the genus Lactuca
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	informal terms for money

sugar (verb)	lettuce (verb)
sweeten with sugar