✅ Worldwide means extended or spread throughout the world (The singer went on a worldwide concert tour across many countries).

✅ Ubiquitous refers to something that seems to be everywhere at once or is constantly encountered (Smartphones have become ubiquitous in modern life).

✅ Both words describe something that is widespread.

✅ Worldwide specifically refers to global reach, while ubiquitous can describe something that is common or seems to be everywhere in a certain setting (The company has a worldwide presence, with offices on several continents; The ubiquitous use of social media has changed the way people communicate).

✅ Wrong means incorrect or mistaken (Your answer was wrong — please try again).

✅ Fallacious refers to reasoning or arguments that are misleading or based on incorrect logic (His fallacious argument sounded convincing but was logically flawed).

✅ Both words describe something incorrect.

✅ Wrong is commonly used for everyday mistakes, while fallacious is typically used in the context of arguments or reasoning (I took a wrong turn on my drive and ended up lost; The fallacious reasoning in the debate was quickly exposed).

✅ To block means to stop or prevent something from progressing or happening (The stress of learning how to use this new software has blocked my creative side).

✅ To obstruct means to create obstacles that make it difficult for something to happen, often on purpose (Our manager refused to share important information during the meeting, which obstructed our progress on the project).

✅ Both words involve creating barriers or stopping movement.

✅ Block implies a more definitive interruption or barrier, while obstruct often implies intentional or systematic interference that makes it difficult to achieve progress (Negative thoughts often block my ability to see the positive side of situations; The legal team tried to obstruct the investigation by withholding evidence).