ADJ. correct, incorrect | conventional, usual | alternative, different, variant | American, English, etc. | phonetic
VERB + SPELLING use | check | correct | improve
SPELLING + NOUN error, mistake | test | checker | dictionary, rule | variant | reform
PREP. in … ~ In American spelling ‘travelled’ only has one ‘l’. | ~ for/of The document uses the British spelling for caesium.
PHRASES be good/poor, etc. at spelling