The book "504 Essential English Vocabulary" is one of the books that every language learner is familiar with. This book contains 504 essential and widely used English words that language learners must have a good command of to learn English.

In 504 words software, we have tried to facilitate the learning process by providing different facilities and using the necessary points in teaching English.

Some app locations:

* Word categories

* Ask questions and tests next to each lesson to learn more

* Review and test the learned words

* Simple yet functional user interface

* Practical English words with Persian and English translations

* View the learning path to motivate more

* Audio dialect of each word with different sounds

* Examples of 504 words book with Persian translation

* Multiple choice English to Persian tests and vice versa

* 42 3-step lessons for teaching

* Repeat words to learn more (7 times each word)