Central
Middle
Synonyms: Middle, halfway, mid, medial, middling, intermedial, inner, interior, centre, midway, median, mean, intermediate, mesial, innermost, and nuclear.
Main
Synonyms: Main, principal, leading, first, predominant, (most) prominent, crucial, essential, fundamental, staple, pivotal, prime, premier, major, master, overriding, capital, ultimate, highest, top, arch-, chief, primary, foremost, most important, dominant, key, vital, basic, core, critical, salient, focal, paramount, ruling, supreme, cardinal, pre-eminent, uppermost, utmost, topmost, and number-one.
Example Sentences
The central location is convenient for everyone.
The central office handles all inquiries.
The central theme of the story.
He lives in the central district.
The central heating system stopped working.