Whether ...or / not only ...but also

Whether ...or   (if)

This conjunction is used to show two different options within a sentence and can be used both the manners of confirmation and  negation.

 Andrew wasn’t sure whether to go on holiday or stay at home.

Not only......but also

This correlative conjunction is similar to “both…and” and emphasizes that two items belong in a pair.

Not only did we get lost, but we also ran out of gas with no gas station in sight.

The TV show has not only good actors but also an incredibly written script.