And vs But - And is used to join two or more words, phrases, or related sentences together. But is used to show a contradiction, an exception, or an objection.

Farther vs Further - While farther strictly expresses greater distances in time or space, further can be used differently. As an adjective, further is also used to describe something as additional or greater in degree.

Example vs Sample - The word example is used to mention an illustration, in support of a claim. The word sample is used to denote a specimen or model.

If vs Whether - If is used to describe a condition. Whether is used to describe possibilities or options.

Fewer vs Less - If the noun being measured is countable, like bowls of rice or chocolate bars, use fewer. If the noun cannot be counted, like rice or chocolate, use less.

Idea vs Concept - An idea is a rough mental impression. It could be a thought, suggestion, opinion, belief or intention. Concept stands for an understanding drawn from a particular fact or logic. A concept could also be an established…

Which vs That - That is used for restrictive clauses. Which is used for nonrestrictive clauses.

Imply vs Infer - Imply means to say something without actually saying it. Infer means to conclude something based on the information received.

Elder vs Older - Elder is an adjective that can be used only when you are talking about people. Older is an adjective, as well. But, unlike elder, it can be used for people as well as for animals and things.

Adapt vs Adopt - Adapt is used either when a change is made to make something more suitable for a particular use or when adjusting to a new place. Adopt is used when something is taken over, chosen, accepted or approved by choice.