Vocabulary knowledge is an important part of learning and using the English language. It helps learners understand what they hear and express their ideas clearly. Speaking fluency refers to the ability to speak English smoothly and confidently. There is a close relationship between vocabulary knowledge and speaking fluency. Students with a wider vocabulary often find it easier to communicate in English. They can choose suitable words to express their thoughts and opinions. Limited vocabulary, however, may make speaking more difficult for language learners. Students may know what they want to say but cannot find the appropriate words. This can cause hesitation, repetition, and pauses during conversations. For this reason, developing vocabulary is essential for improving speaking fluency. Students can learn new words through reading books, articles, and educational materials. Listening to English conversations, podcasts, and videos can also introduce useful vocabulary. Using new words in daily conversations helps students remember them more effectively. Teachers can encourage students to practice new vocabulary through speaking activities. Pair work and group discussions can provide opportunities for students to use English naturally. Role-playing activities can also help learners practice vocabulary in realistic situations. Students should learn not only individual words but also common phrases and expressions. Learning words in context helps students understand their meanings and use them correctly. Regular speaking practice can increase students’ confidence and reduce their fear of making mistakes. Technology can also support vocabulary learning through language-learning applications and digital resources. A strong vocabulary allows students to communicate ideas more accurately and effectively. It also helps them participate in classroom discussions and academic presentations. Therefore, vocabulary development should be an important part of English language instruction. Teachers should combine vocabulary learning with regular speaking practice. In conclusion, improving vocabulary knowledge can contribute significantly to better speaking fluency.