Substitute.
Substitute or exchange can be used instead of replace.
You can use the word "demanding" as a synonym for "challenging."
You can use the word "they" as a replacement for "them" in many cases in English language.
Another word you can use instead of formality is "politeness" or "etiquette."
Reliable.
The United States uses the word "fall" instead of "autumn" to refer to the season.
there is no word in the English language to replace we
The's no single word that you can use to replace is. It depends on the context.ExamplesThe book is lying on the table (for The book is on the table).The castle stands at the top of the mountain (for The castle is at the top of the mountain).
There are many words one can use as a replacement of the word 'gust.' Some of the best words that can be used to replace this are breeze, gale, and blow.
You could use you're, or you can replace the you, with the person's name, although then it sounds a little weird, very third person like.
Instead of using I in a essay paper what word do you use?
You can use the word "demanding" as a synonym for "challenging."
Will, when, why, it, can
or
mixture
I have a stomach ache.
Myself
are