• Pinnacle is similar to Apex. • Apex (noun) English Meaning: The top or highest part of something. Bangla Meaning: উচ্চতম বিন্দু; শীর্ষবিন্দু: the apex of a triangle; the apex of one’s career/fortunes. Synonyms: Pinnacle (সূচাগ্র,), Peak (সর্বোচ্চ), Highest (শীর্ষ), Maximum, Top(চূড়া)। Antonyms: Base(ভিত্তি), Nadir(সর্বনিম্ন), Bottom (তলা), Minimum(সামান্যতম), Lowest (সর্বনিম্ন) • Other Forms: - Apical (adjective) • Example Sentence: 1. At 37, she'd reached the apex of her career. 2. She reached the apex of fame, only to find it wasn't what she expected.Source: Website Lecture.