sugar vs lucre

sugar and lucre both are nouns.

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

As nouns, sugar and lucre are synonyms defined as:

sugar (noun)	lucre (noun)
a white crystalline carbohydrate used as a sweetener and preservative	the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)
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

sugar (verb)	lucre (verb)
sweeten with sugar