Recur and Reoccur can usually be used interchangeably, but try to find some other synonyms that sound less alike for style.
Maybe
yes. speed is velocity.
Ise and ize are often used interchangeably: realize and realise.
Apostrophes and quotation marks can be used interchangeably.
Adjuvant therapy is used to decrease the chances that cancer will recur.
The words nation and country can be used interchangeably and are synonyms. There are thousands of synonyms in the English language.
No, the words "assail" and "attack" are synonymous and can be used interchangeably to describe a violent or aggressive action towards someone or something.
There are various dollar words that are used interchangeably. Some of the common words used as substitutes for dollar include cash, buck, bill, note, dough and many more.
No they can not be used interchangeably
These two words can often be used interchangeably. However, they can differ when build is used as a physical concept and construct is used as an abstract concept.
No. In and with are not interchangeable.
No. They are two different words and should never be used interchangeably.