What word to replace the word “should” with?

The word that best replaces "should" depends on the context in which it is used. Generally speaking, the best word to replace "should" with is "must". This conveys a sense of obligation or necessity, which is often what "should" is used to convey. For example, instead of saying "you should do your homework", you could say "you must do your homework".

In some contexts, other words may be better suited to replace "should". For example, if the context is more casual and less serious, words like "could", "might", or "can" can be used. For example, instead of saying "you should go to the store", you could say "you could go to the store".

In some contexts, "ought to" can be used to replace "should". This conveys a sense of moral obligation or duty, which is often the intent when using "should". For example, instead of saying "you should be kind to others", you could say "you ought to be kind to others".

Ultimately, the best word to replace "should" depends on the context in which it is used.