Difference between Less and Least

Less

Part of speech: adverb

Definition: to smaller extent In lower degree

Part of speech: determiner

Definition: Comparative form of little; smaller, not so great. A smaller number of; fewer.

Part of speech: preposition

Definition: minus; not including

Least

Part of speech: determiner

Definition: ;The smallest amount of [something uncountable].

Part of speech: adverb

Definition: Used for forming superlatives of adjectives, especially those that do not form the superlative by adding -est.