Either-Whether | Commonly Confused Words

Either

/ˈaɪðər/

Used to refer to one or the other of two things

You mustn't let that child make that noise either.And yet without a word on either side.I have never seen either Mr. or Mrs. Elton.

/ˈweðə/

Used to introduce alternatives or express doubt between choices

Life moves forward, whether you like it or not.Whether Sophronia was adopted by his mother?Meg did not know whether to laugh or cry.

This word has no antonyms

Either often presents a choice between two alternatives, while whether introduces a condition or possibility.
Remember that either is often followed by or, such as either this or that.
Whether, on the other hand, is often followed by or not, such as whether or not.
Think of either as selecting an option, and whether as thinking about a situation or condition.
Either can be used when confirming one or more out of two choices, while whether implies uncertainty or doubt about something.