Usage distinctions where pronunciation materially affects the confusion or diagnosis.
“Coarse” is an adjective meaning rough, not finely divided, or rude/offensive. “Course” is usually a noun for a route, sequence, class, meal part, or development, and can also be a verb meaning to flow. In mainstream Cambridge pronunciation, the pair are homophones.
“Flaunt” means to show something off conspicuously, often to attract admiration. “Flout” means deliberately disobey or disregard a rule, law, convention, or custom. The words are semantically different and also have distinct standard pronunciations.
“Formerly” means in the past or previously. “Formally” means officially or in a serious, correct, or ceremonious manner. The spelling difference is small, and some accents reduce the pronunciation contrast, so substitution by meaning is the safer diagnostic.
Lead is the base/present form of the verb meaning guide or be in front, pronounced /liːd/ in that use. Led is its past tense and past participle, pronounced /led/. The spelling lead is also a noun for the metal pronounced /led/, which creates a separate homograph trap.
“Moral” relates to standards of right and wrong and can also mean a lesson drawn from a story. “Morale” is the confidence or spirit felt by a person or group, especially in difficult circumstances. Their meanings, word classes, and pronunciations differ.
“Quiet,” “quite,” and “quit” differ in spelling, pronunciation, grammar, and meaning. “Quiet” relates to little noise, “quite” modifies degree, and “quit” is a verb for stopping, leaving, or giving up.
The useful distinction is spelling versus pronunciation. “Tsk” represents the click/disapproval sound in standard dictionary spelling; “tisk” reflects how readers often vocalize that spelling. This guide does not pretend that every informal “tisk” in dialogue is incomprehensible or impossible.
The choice between “zed” and “zee” is a regional pronunciation/name difference for the letter Z, not a difference in spelling or alphabetic identity.
