“Gainsay” is a tricky word to remember. Just think about some one who has made huge gains in a business. But when others ask her whether she actually made those gains, she denies flatly! Remember thus!
“Factitious” should remind you of “Fictitious”. Both words denote “imaginary” things, although there is a subtle difference between the two.
The pronunciation of the word “Gaffe” is “Gaf’”, which should rhymes in a way (not entirely though) with the word “Cough” (pronounced as “Kawf”). Imagine yourself constantly coughing while an important event is underway. It could be pretty embarrassing, can’t it? Remember thus!
“Factions” rhymes with “Fractions”. Just like a fraction is part of a number, a faction is a smaller part of a group. Remember thus!
“Facsimile” should remind you of “fake smile”. It looks like a smile but guess what: its fake!
By providing “facility” to someone, you help them achieve their goals in an easier manner. “Facilitate” should remind you of “facility” that makes achieving or doing something easier.
A facile problem is so superficial, simple and docile like a puppy that you are not afraid to face it!