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Worse vs. Worst

Worse is the comparative form of the adjective "bad." Worst is the superlative form of "bad."
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Greatful or Grateful

Grateful is used to express appreciation, while greatful is the incorrect spelling of the word grateful.
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Recurring vs. Reoccurring

Recurring refers to something that regularly repeats itself. Reoccurring refers something that happens repeatedly but does not follow a pattern.
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Spelt or Spelled

Spelt and spelled convey different forms of spell, which means to write letters of a word in the correct order.
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Thru vs. Through

Thru is the informal or colloquial variation of through, which usually means the passing of one point to another.
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Comma Before or After But

When a comma precedes "but," "but" is connecting two independent clauses. When a comma appears after "but," it typically indicates the use of an introductory element or a parenthetical phrase.
How to

Contacting Professors at a U.S. University

If you’re in a small class of less than 30 people, feel free to approach your professor directly before or after class to ask them a question, and use that as a starting point to introduce yourself and get them to remember you.
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Learnt vs Learned

Both words are used to convey the past tense and past participle of the verb learn. The choice between these two spellings often depends on regional differences in English usage.
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Contemporaries Meaning and Examples

The noun "contemporaries" refers to people or things that exist or occurred during the same time period, often with a suggestion of being roughly of the same age or generation.