Answer: homophones

AnswerCrossword Clue
HOMOPHONES"To" and "too," for two
HOMOPHONESRead and blew, for red and blue
homophonesEach of a set of symbols denoting the same sound or group of sounds
homophonesHOMOPHONE, a word that sounds the same as another but is spelt differently eg 'to', 'too' and 'two'
homophonesEach of two or more words having the same pronunciation but different meanings, origins, or spelling, e.g., new and knew