: Usually dominated by "function words" like the , be , and , of , and a .

Note that this is a simplified example, and you may want to include additional features, such as word definitions, synonyms, and antonyms.

Do not trust random, unverified lists. Use sources based on frequency corpora (massive databases of real English usage).

: These form the foundation (Levels A1–B2) and are often referred to as the Oxford 3000 .

This is the most critical gap for intermediate learners. These words allow for nuance. Instead of saying "The car is bad," you can say "The vehicle is unreliable ." This tier includes words like opportunity, essential, decision, and process . Reaching the 3,000-word mark generally signifies B1 to B2 level proficiency (intermediate to upper-intermediate).

Several authoritative lists provide the full 5,000 words along with learning tools: The Oxford 5000™ (American English)

In the field of applied linguistics and second language acquisition, few resources are as frequently cited or widely used as frequency-based vocabulary lists. Among these, the occupies a unique and powerful position. Unlike the 1,000 most common words (which provide basic survival phrases) or the 10,000 most common (which approach near-native fluency), the 5,000-word threshold represents a proven tipping point for functional proficiency.

There are several sources for such a list, and I'll provide you with a few options: