Which of the following is an antonym of the word 'Apex'?

Apex (noun)

• Synonyms: Pinnacle (সূচাগ্র,), Peak (সর্বোচ্চ), Highest (শীর্ষ), Maximum,
Top(চূড়া)।
• Antonyms: Base(ভিত্তি), Nadir(সর্বনিম্ন), Bottom (তলা), Minimum(সামান্যতম),
Lowest (সর্বনিম্ন)

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.
Other Forms: Apical (adjective)
Example Sentence: 
1. At 37, she would reached the apex of her career.
2. She reached the apex of fame, only to find it wasn't what she expected.

অন্য অপশন গুলোর মধ্যে - 
Accolade - জয়ধ্বনি।
Swank - দাম্ভিক আচরণ

Source: Lecture.