However, it is unlikely that any one individual knows the meaning of all English words. Most Americans only use 800-1,000 words in everyday conversation. A typical American college student knows 20,000-30,000 words on graduation. E very language can create new words to describe new situations and objects. Therefore, it is not surprising that all languages change through time.
None is static.
However, they change at different rates at different times in response to changing social, cultural, and environmental conditions. Some cultures strongly resist the acquisition of new words from other languages. This has been the case with the French government's response to the dramatic invasion of English words, especially in pop culture and technology. Other societies more openly embrace new words. This largely has been the case with North America in the 20th century.