The term 'banana oil' is composed of four words: ESTER (5 letters), esters (6 letters), BLARNEY (7 letters), and amyl (4 letters). Esters are organic compounds derived from an inorganic acid and an alcohol, and they are often used as solvents or fragrances. BLARNEY is a type of flattery or persuasive talk that is meant to deceive or mislead. Amyl is a type of alcohol found in essential oils, and it is also used as a fuel additive. Together, these four words form the term 'banana oil, ' which is a slang term for something that is false or insincere.