1. whether - Pronoun
2. whether - Conjunction
3. whether - Determiner
Which (of two); which one (of two); -- used interrogatively and relatively.
In case; if; -- used to introduce the first or two or more alternative clauses, the other or others being connected by or, or by or whether. When the second of two alternatives is the simple negative of the first it is sometimes only indicated by the particle not or no after the correlative, and sometimes it is omitted entirely as being distinctly implied in the whether of the first.
Source: Webster's dictionaryWe must love everyone regardless of whether or not they love us; that is their business. Ephraim of Arizona
God is everywhere. You decide whether you are close to Him or not. John Chrysostom
People don't notice whether it's winter or summer when they're happy. Anton Chekhov
The cobra will bite you whether you call it cobra or Mr. Cobra. Hindi Proverb
Whether it rains or stops raining, the lentils have two eyes. Ethiopian Proverb
A thief is a thief, whether he steals a diamond or a cucumber. Hindi Proverb