margarine vs naphtha

margarine

noun
  • A spread, manufactured from a blend of vegetable oils (some of which are hydrogenated), emulsifiers etc, mostly used as a substitute for butter. 

naphtha

noun
  • Any of a wide variety of aliphatic or aromatic liquid hydrocarbon mixtures distilled from petroleum or coal tar, especially as used in solvents or petrol. 

How often have the words margarine and naphtha occurred in a corpus of books? (source: Google Ngram Viewer )