pancake vs flapjack

pancake and flapjack both are nouns.

Word	Noun	Adjective	Verb	Adverb
pancake	Yes	No	No	No
flapjack	Yes	No	No	No

As nouns, pancake and flapjack are synonyms defined as:

pancake and flapjack: a flat cake of thin batter fried on both sides on a griddle

Other synonyms of pancake include battercake, flannel-cake, flannel cake, flapcake, griddlecake, hot cake, hotcake.

pancake (noun)	flapjack (noun)
a flat cake of thin batter fried on both sides on a griddle	a flat cake of thin batter fried on both sides on a griddle